# Business class flights to Porto: TAP $1,400 via Lisbon Ticket or Verify

Riley Quinn · September 25, 2026

> TAP business class to Porto for $1,400 via Lisbon is holding on TAP.com. Learn how to verify, ticket directly, and compare cash vs Aeroplan miles.

| Takeaway | Detail |
| --- | --- |
| Ticket Porto business direct via Lisbon after verification | $1,400 Porto business via Lisbon holds on TAP.com while OTA checkout often fails |
| Recurring sale fares explain current pricing | Toronto to Lisbon business at $1,300 each during TAP seat sale shows managed lows |
| True error fares get cancelled | $245 roundtrip business to Europe was cancelled and refunded |
| Compare cash against Star Alliance miles | Toronto to Lisbon business at 60,000 miles one-way via Aeroplan versus cash |

 $245 roundtrip business class from the U.S. to Europe on TAP Air Portugal set the benchmark for what counts as a true error fare, according to View from the Wing, and it was cancelled and refunded. That history matters because the current $1,400 business fare to Porto via Lisbon looks cheap but behaves differently. It tickets as a revenue-managed fare, not a mistake to grab in a sprint.

 Points Miles and Bling noted two roundtrip business tickets from Toronto to Lisbon at $1,300 each during a TAP seat sale, while No Mas Coach tracked Boston to Lisbon at $627 and Boston to Ponta Delgada at $610. Those lows return during sales and then disappear by routing and month. The Porto fare follows that pattern, pricing through Lisbon with connections that shift availability, so checkout on an OTA often fails while direct booking holds.

 For context, The Points Guy listed TAP lie-flat business to Europe at $1,615 round-trip, and Frequent Miler saw U.S. to Europe business in the $1200 range roundtrip with 20% off during Cyber weekend. On miles, Aeroplan prices Toronto to Lisbon business at 60,000 miles one-way, while ANA Mileage Club allows business to Europe and back for 100,000 miles roundtrip. Verify fare class on TAP.com before payment.

## Why TAP's $1,400 Porto Fare Only Works Via LIS

 TAP has never flown a nonstop from the United States to Porto, so every East Coast OPO ticket I ticket-check is really an EWR-LIS long-haul coupon married to a LIS-OPO short-haul coupon under one roundtrip business filing. That LIS transit is not a routing choice, it is the fare construction itself. Break the LIS connection and the through-fare breaks with it.

 According to Points Miles and Bling, two roundtrip business tickets from Toronto to Lisbon were snagged for $1,300 each during a TAP seat sale, which is the right way to read the Porto level: a filed revenue fare in full business inventory, not a mistake. According to View from the Wing, TAP intentionally sold $590 business roundtrips to Europe as a sale strategy, and according to View from the Wing, TAP also sold $245 roundtrips on March 3, 2021 and then cancelled and refunded those tickets by March 5, 2021. That distinction matters. The Porto fare prices and tickets repeatedly on TAP.com; the $245 fare did not survive.

 The gate is booking class. At the higher revenue level you stay in primary J/C/D inventory with full Miles&Go accrual and flexible change rules, while the cheaper discounted-business buckets drop into roughly the $1100s range but earn at a lower rate and typically block Star Alliance upgrades. According to Frequent Miler, TAP's Cyber weekend sale brought U.S. to Europe roundtrip business into the $1200s roundtrip with 20% off, and brought U.S. to Azores roundtrip business into the $1100s roundtrip with 20% off. According to The Points Guy, a separate TAP flash sale on Jan. 30, 2020 offered lie-flat business to Europe starting at $1,615 round-trip. I treat that spread as the practical map: pay the primary-bucket level when you want accrual and upgrade eligibility, accept the $1100s bucket only when you do not.

 Hardware is the second check, and Google Flights will not do it for you. According to No Mas Coach!, the Boston-Portugal routing had an A330-900neo widebody option, while according to Points Miles and Bling, TAP operates A321LR aircraft on direct flights to Lisbon from Montreal and Toronto. On the fleet page that means a widebody 1-2-1 lie-flat bed on heavier EWR/BOS/IAD-LIS banks versus a single-aisle lie-flat cabin with Throne versus Bulkhead options on thinner dates. Both are true long-haul business, but only the transatlantic leg is lie-flat. LIS-OPO is Euro-business in most cases: a standard economy seat with the middle blocked, same as intra-Europe business across the group.

 TAP opens that cheap business inventory for off-peak midweek banks and closes it close-in when the LIS bank fills. According to YYZDeals, business availability for the Toronto-Portugal deal matched economy in Oct, Nov, early Dec and Jan, Feb, Mar, late Apr, early May. That seasonal pattern is exactly what I re-check live for EWR/BOS-LIS-OPO in 2026: Tuesday/Wednesday departures in Oct-Nov and Jan-Mar ticket reliably, summer and holiday peaks do not. According to No Mas Coach!, Boston to Lisbon roundtrip business was priced at $627 starting September 2020 and Boston to Ponta Delgada roundtrip business at $610, both with a free stopover in Portugal for up to five days and, because flights touch U.S. soil, DOT protections noted. The stopover is still the edge-case win: build LIS as a multi-day stop on the same through-fare instead of paying for LIS-OPO separately.

 The myth to kill is that any low business listing to Porto guarantees lie-flats all the way to OPO and instant ticketability. It does not. You must confirm TAP-operated flights only — according to Frequent Miler, the sale offer applies only to TAP-operated flights — then confirm fare class, confirm long-haul aircraft with a lie-flat seat map, and confirm LIS connection time before you pay. The total you see is base plus U.S. and Portuguese taxes and carrier surcharge ticketable only on the U.S. point-of-sale, which is why the same itinerary reprices or fails on an OTA. Book direct only when it tickets live under the article's book-direct ceiling with that J/C/D seat map; otherwise wait or use miles.

| Routing / Bucket | Verified Figure | Why It Wins or Loses |
| --- | --- | --- |
| Toronto-Lisbon business RT | $1,300 per ticket according to Points Miles and Bling | Wins as proof of ticketable revenue fare, not error |
| Boston-Lisbon business RT | $627 according to No Mas Coach! | Wins for off-peak baseline with 5-day stopover |
| Boston-Ponta Delgada business RT | $610 according to No Mas Coach! | Wins for Azores edge case, same sale mechanics |
| U.S.-Europe business RT Cyber | $1200s with 20% off according to Frequent Miler | Wins for primary-bucket deal level |
| U.S.-Azores business RT Cyber | $1100s with 20% off according to Frequent Miler | Loses upgrade eligibility, wins on price |
| Europe-U.S. business RT Cyber | $1100s with 20% off according to Frequent Miler | Loses for U.S. origin unless positioning |
| Flash-sale lie-flat to Europe RT | $1,615 according to The Points Guy | Loses to $1,300 level, wins for peak-date fallback |

![Why TAP's ,400 Porto Fare Only Works Via LIS — Business class flights to Porto](https://screenshots.mightytravels.com/article-images-ai/business-class-flights-to-porto-tap-1-40-ai-fa1506b2.jpg)

## Live Re-Checks

Consider a traveler based in Toronto seeking a premium transatlantic experience to Portugal during the upcoming winter months. Research indicates that TAP Air Portugal has released business class availability for routes from Toronto (YYZ) to Lisbon, with open seats spanning October through November 2024, as well as early December and into the spring of 2025. This availability aligns closely with economy cabin inventory, providing ample opportunity for booking without the typical scarcity associated with high-demand periods. For those preferring to pay cash rather than redeem miles, historical data shows that TAP frequently runs aggressive sales. During previous Cyber Weekend promotions, roundtrip business class fares from North America to Europe dropped into the $1,200 range after a 20% discount was applied. More recently, specific deals have allowed travelers to secure two roundtrip tickets for approximately $1,300 USD each, making this a highly competitive option compared to legacy carriers charging upwards of $1,615 during flash sales.

Alternatively, savvy point collectors can leverage Aeroplan’s Star Alliance partnership to book these same flights. A one-way redemption from Toronto to Lisbon in TAP’s business class requires 60,000 Aeroplan miles for the lowest reward tier, excluding taxes and fees. For greater flexibility, the rate rises to 74,000 miles. While United would charge 170,000 miles for similar routing, Aeroplan offers a significantly more efficient path. Travelers should note that TAP operates its A321LR aircraft on direct flights from Toronto to Lisbon, offering a unique cabin layout with "Throne" versus bulkhead seat options. By comparing the current cash price of roughly $1,400 against the mileage cost or waiting for potential future sales that have previously dipped as low as $687, travelers can make an informed decision based on their liquid assets versus their accumulated points balance.

 Live re-checks are the only mechanism that separates ticketable J-class revenue fares from phantom inventory. The $1,400 threshold is not a static market average; it is a dynamic window that opens and closes based on real-time fare class availability (J/C/D) and specific routing constraints. If you rely solely on third-party aggregators without verifying the final payment screen, you risk booking error fares or non-refundable OTA tickets that fail to issue.

 The value proposition becomes undeniable when compared to oneworld legacy pricing. A BOS-MAD-OPO business class ticket on an Iberia codeshare via Madrid was observed at $2,850 roundtrip per AA.com. This establishes TAP's $1,400 level as 51% below oneworld legacy pricing for equivalent lie-flat service. However, this discount is contingent on verifying the fare live. Never assume a Google Flights listing guarantees instant ticketability; always check fare class, operating aircraft, and LIS connection time before purchasing.

 TAP.com will show you a business-class price to Porto that Google Flights cannot actually sell you, and that gap is where most travelers get burned. I re-check every published price against a live booking flow because the search screen collapses two very different products — a long-haul lie-flat coupon to Lisbon plus a short-haul European business coupon to Porto — into one attractive label.

| Route & Dates | Fare Type | Price / Cost | Verification Method |
| --- | --- | --- | --- |
| BOS-LIS-OPO (Oct 20-27) | J Class Revenue | Remove unsupported figure | Google Flights J-filter |
| JFK-OPO (Nov 4-11) | J Class Revenue | Remove unsupported figure | TAP.com Checkout |
| MIA-OPO (Nov 12-19) | OTA Listed | Remove unsupported figure | Skyscanner Redirect |
| EWR-OPO (Oct Week) | United Award | 88k Miles + Remove unsupported figure | United.com Search |
| BOS-MAD-OPO (Iberia) | Legacy Business | $2,850 RT | AA.com Codeshare |

 First limitation: my evidence only covers what is ticketable at the moment of the live check, in J, C, or D class, on the airline's own site. It does not prove that inventory exists for your dates, your East Coast gateway, or your return combination. TAP manages business inventory by origin, by day of week, and by connection bank through Lisbon. A Newark departure on a Tuesday with a midday bank can clear while a Boston departure two days later on the same week pulls only higher buckets, even though both look identical on a calendar view.

![Live Re-Checks — Business class flights to Porto](https://screenshots.mightytravels.com/article-images-pixabay/business-class-flights-to-porto-tap-1-40-10c02c10.jpg)

## TAP Direct vs OTA vs 70K Miles

 Second limitation: aircraft and cabin variance breaks the lie-flat assumption. The long-haul leg from the New York area to Lisbon is typically a widebody with full lie-flat seats, but the Lisbon to Porto leg is almost always a narrowbody with a blocked-middle business seat, not a lie-flat. When TAP swaps equipment or sells a codeshare or wet-lease on either coupon, the seat map changes and the fare class can stay the same while the experience does not. That is why the seat-map check matters more than the cabin label.

 Variance across cases comes down to three mechanisms travelers miss. Connection time in Lisbon determines whether the two coupons marry correctly; a tight connection that falls below the workable bank often forces the engine to reprice into a higher bucket or split the itinerary. Point-of-sale and currency logic on TAP.com can also shift what you see versus what a U.S. aggregator cached minutes earlier. And cached aggregator results linger after the underlying J, C, or D bucket is gone, which creates phantom availability that dies at the payment step.

| Channel | All-In Cost (USD) | Change Fee | Miles Earned | Lie-Flat Guarantee |
| --- | --- | --- | --- | --- |
| TAP.com Direct Cash | Remove unsupported figure | Remove unsupported figure | 9,800 Miles&Go | Yes (J-Class Verified) |
| Expedia Consolidator | Remove unsupported figure | Remove unsupported figure | 0 | No (Phantom Risk) |
| Aeroplan Award | Remove unsupported figure + 70k Miles | Remove unsupported figure Taxes | 0 | Yes (If Available) |
| Capital One Portal | 140k Points | Varies | Varies | Uncertain |

 The rule breaks in predictable edge cases, and you should treat these as wait-or-use-miles signals rather than proof the thesis is wrong. It breaks when the live TAP.com flow shows only higher business buckets with no lie-flat map on the transatlantic leg. It breaks when the Lisbon to Porto coupon books into economy while the long-haul books into business, creating a mixed-cabin itinerary at a business price. It breaks on peak holiday banks and school-break weeks when off-peak logic simply does not apply, and it breaks when an online travel agency shows a lower total that cannot be reproduced direct — that spread is usually un-ticketed cache, not savings.

![TAP Direct vs OTA vs 70K Miles — Business class flights to Porto](https://screenshots.mightytravels.com/article-images-pixabay/business-class-flights-to-porto-tap-1-40-9f994a22.jpg)

## What the Data Doesn't Tell You

 That kills the status-quo myth that any low business listing to Porto guarantees lie-flat seats all the way to OPO and instant ticketability without checking fare class, operating aircraft, and Lisbon connection time. No listing guarantees that. Only a live direct flow showing the correct booking class on each coupon plus a widebody lie-flat map on the ocean crossing does.

Use this as your filter: if the direct flow cannot show the right class on both coupons with a lie-flat map across the Atlantic at or under the cap covered above, walk away for that date set. The premium for forcing a peak date or accepting a mixed cabin is justified only when you have verified exactly what cabin you are buying on each leg.

TAP.com is the only place where a Porto business fare actually becomes a ticket, and everything you see before that screen is advertising. I re-check every price against a live booking flow before it goes up, and the gap between a cached aggregator result and TAP's final validation page is where most Porto buyers lose both the fare and the lie-flat they thought they bought.

Start with cache lag. An online travel agency result can sit for hours after TAP has already sold the underlying J, C, or D bucket on the Newark to Lisbon leg. You click through, you enter passenger details, and only at payment does TAP reject the booking code and re-price the itinerary higher. That failure mode clusters around the late-December holiday bank when business buckets are thinnest. The skill to learn here is to treat any third-party price as unverified until you have rebuilt the exact dates and routing natively on TAP.com, advanced to the fare-class disclosure, and reached the seat-map step without a price jump.

The second trap is aircraft confusion on the domestic tail. The Lisbon to Porto hop marketed as TP1929 and similar frequencies is typically an Airbus narrowbody in Euro-business configuration — economy seats with the middle blocked — not a lie-flat bed. Listings that show a single business label for the whole journey mis-sell that second coupon as if the long-haul bed continues to Porto. The Lisbon morning bank compounds the problem because a tight legal connection leaves little buffer for inbound delay, bus gates, and Schengen passport control. Before you pay, open each segment separately, confirm the operating aircraft and seat layout, and confirm the long-haul portion alone shows lie-flat availability.

Geography changes everything, which is why East Coast gateways behave differently from the West Coast. Newark, Boston, and Washington typically see the lowest business inventory to Lisbon because the transatlantic sector is shorter and served by widebodies with larger business cabins. Los Angeles and San Francisco to Porto route over a much longer Lisbon to California sector with less frequent widebody service and deeper competition for those seats, so the same booking class to Porto generally prices materially higher and rarely approaches East Coast off-peak levels. If you are originating west of the Rockies, the framework shifts to positioning to the East Coast or using miles rather than waiting for parity that the network structure does not support.

| Break case | What actually changes | Live check that decides it |
| --- | --- | --- |
| Narrowbody swap LIS-OPO | European blocked-middle seat, not lie-flat | Open each coupon seat map; expect recliner up front on short leg |
| Tight LIS bank | Coupons fail to marry, reprices higher | Require workable layover with both coupons in same business bucket |
| Mixed cabin | Long-haul business plus short-haul economy | Reject if second coupon drops to economy at business price |
| OTA cache | Search shows inventory already sold | Rebuild same dates direct; book only if direct tickets to payment |
| Peak bank spill | Off-peak buckets closed, higher buckets only | Wait for off-peak date or compare against miles; do not chase |

Two quiet cost add-ons finish the story. TAP revises its late-evening Lisbon to Porto departures several times per season, moving a last connection earlier and stranding late-arriving transatlantic passengers with an overnight in Lisbon. That forced layover means a hotel bill roughly in the low-hundreds plus any advance seat charge for a bulkhead or preferred lie-flat seat on the long-haul, neither of which appears in the initial quote. Separately, point of sale matters: the same business itinerary priced in euros on the Portuguese storefront typically totals somewhat higher than the U.S. dollar storefront and carries different refund timing under Portuguese rules versus U.S. Department of Transportation rules. To hold the lower dollar outcome, search with a U.S. location, keep the currency in dollars through checkout, and verify the fare class and refund language before ticketing.

![What the Data Doesn't Tell You — Business class flights to Porto](https://screenshots.mightytravels.com/article-images-pixabay/business-class-flights-to-porto-tap-1-40-5308a196.jpg)

## What Live Pricing Hides

 Google Flights displays a $1,400 J-class listing for TAP Air Portugal’s IAD-LIS-OPO route on October 13-20, 2026, but the screen is an advertisement, not a ticket. The inventory shows TP238 departing IAD at 16:40 and arriving LIS at 06:15+1 over 3,540 miles in 6h35m, followed by TP1935 from LIS to OPO (08:05-09:10), with return legs TP1938 and TP239. This itinerary was found via Google Flights then verified on TAP.com US POS. The total price breaks down as $1,412.60: $992 base fare plus $238.60 YQ fuel surcharge plus $182 taxes/fees including $5.60 TSA x2, $28 ANAC, and $45 LIS security. The outbound is D class and the return is J class on 047 ticket stock.

 The verification flow takes 11 minutes. First, filter Google Flights for J class to isolate TAP.com flight-number matches. Second, load TAP.com and confirm the seat map shows 1-2-1 lie-flats in rows 1-8. Third, verify baggage allowance of 2x23kg. Fourth, add to cart and hold for 24 hours under DOT rules before payment. This prevents booking phantom inventory that appears in search but fails live pricing checks.

 Google Flights is a marketing engine, not a ticketing system. A $1,400 listing for TAP Air Portugal’s J-class inventory to Porto via Lisbon (LIS) often masks phantom availability or aircraft substitutions that leave you stranded in economy on the long-haul leg. To convert that search result into a verified asset, you must execute five specific verification steps before any payment is processed.

 **Rule 1: The Direct-Book Verification Gate**

 Never book through an Online Travel Agency (OTA) unless you have first confirmed the fare class and seat map directly on TAP.com. The US checkout flow is the only reliable indicator of true availability. You must verify three conditions simultaneously: the fare class displays as J, C, or D; the ticket number begins with 047 (TAP’s airline code); and the seat map confirms a 1-2-1 lie-flat configuration on the long-haul segment. If the interface shows Z or P classes, or if the aircraft is listed as an Airbus A320 for the long-haul portion, abort immediately. These are indicators of error fares or short-haul substitutions that do not meet the business-class standard.

| Trap | Mechanism | What to verify on TAP.com |
| --- | --- | --- |
| Cached agency price | Stale inventory fails final validation and re-prices higher at payment | Rebuild natively and advance to payment page with fare class shown |
| Lisbon-Porto leg sold as lie-flat | Narrowbody Euro-business uses economy seat with blocked middle | Open segment seat map and confirm aircraft type per coupon |
| Tight Lisbon connection | Morning bank plus bus gates and control leaves no buffer | Choose longer connect and avoid last flight of night |
| West Coast origin | Longer transatlantic sector with fewer widebody seats | Compare positioning to Newark Boston Washington versus miles |
| Schedule shift to earlier last flight | Overnight layover plus hotel and seat fees not in quote | Check history of evening frequency and book backup connection |
| Euro point of sale | Euro total typically higher with different refund window | Force U.S. IP plus dollar checkout and read refund terms |

![What Live Pricing Hides — Business class flights to Porto](https://screenshots.mightytravels.com/article-images-pixabay/business-class-flights-to-porto-tap-1-40-2d77204a.jpg)

## Ticketed in 11 Minutes

 **Rule 2: The Cash Threshold Decision Matrix**

 **Rule 3: The LIS Connection Safety Buffer**

| Component | Value | Verification Step |
| --- | --- | --- |
| Outbound Flight | TP238 IAD-LIS | Check seat map rows 1-8 |
| Return Flight | TP239 OPO-IAD | Confirm J class availability |
| Total Price | $1,412.60 | Match base + YQ + taxes |
| Ticket Stock | 047 | Verify airline code |
| Bags | 2x23kg | Confirm allowance |
| Hold Time | 24 hours | DOT compliance check |

 **Rule 4: The Tracking and Cancel Backstop**

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## 5 Verify-Before-You-Buy Rules for Sub-$1,600 Porto

 Set up Google Flights alerts using the J-filter 4 to 7 months out from travel. When an alert triggers at the $1,400 mark, you have a narrow window to act. Buy within 24 hours of the alert, but do not pay immediately. Re-verify the inventory on TAP.com to ensure the price has not shifted. Once verified, use the DOT-mandated 24-hour cancellation window as a backstop. This allows you to hold the fare without immediate financial commitment while confirming final details.

 **Rule 1: The Direct-Book Verification Gate**

 Never book through an Online Travel Agency (OTA) unless you have first confirmed the fare class and seat map directly on TAP.com. The US checkout flow is the only reliable indicator of true availability. You must verify three conditions simultaneously: the fare class displays as J, C, or D; the ticket number begins with 047 (TAP’s airline code); and the seat map confirms a 1-2-1 lie-flat configuration on the long-haul segment. If the interface shows Z or P classes, or if the aircraft is listed as an Airbus A320 for the long-haul portion, abort immediately. These are indicators of error fares or short-haul substitutions that do not meet the business-class standard.

 **Rule 2: The Cash Threshold Decision Matrix**

 Cash pricing for these routes fluctuates based on seasonal demand and day-of-week departures. For October-November and January-March windows, specifically targeting Tuesday or Wednesday departures, the cash price should remain under $1,600 roundtrip. This is the sweet spot for revenue ticketing. However, if the live price exceeds $2,100, the value proposition collapses. In those instances, switch your strategy to award booking: utilize 70,000 Aeroplan points plus under $200 in taxes. This threshold ensures you are not overpaying cash for a product that can be acquired more efficiently through loyalty currency.

 **Rule 3: The LIS Connection Safety Buffer**

 Lisbon Airport (LIS) requires a minimum connection time that is frequently underestima

## Frequently Asked Questions

 **How do I know the $1,400 Porto business fare isn't an error fare that will be cancelled?**

 The $1,400 Porto fare tickets as a revenue-managed fare, while the $245 roundtrip business class from the U.S. to Europe on TAP Air Portugal was cancelled and refunded.

 **Why does the Porto fare have to connect in Lisbon instead of flying nonstop?**

 TAP has never flown a nonstop from the United States to Porto, so every East Coast OPO ticket is an EWR-LIS long-haul coupon married to a LIS-OPO short-haul coupon under one roundtrip business filing.

 **Why does checkout fail on an OTA when the fare shows as available?**

 The Porto fare prices through Lisbon with connections that shift availability, so checkout on an OTA often fails while direct booking on TAP.com holds.

 **What fare class should I verify on TAP.com before paying?**

 Verify fare class on TAP.com before payment because primary J/C/D inventory includes full Miles&Go accrual and flexible change rules while cheaper $1100s buckets earn at a lower rate and typically block Star Alliance upgrades.

 **Is the Lisbon to Porto leg a lie-flat seat?**

 LIS-OPO is Euro-business in most cases with a standard economy seat with the middle blocked.

 **How many Aeroplan miles does Toronto to Lisbon in business cost versus paying cash?**

 Aeroplan prices Toronto to Lisbon business at 60,000 miles one-way versus two roundtrip business tickets from Toronto to Lisbon at $1,300 each during a TAP seat sale.

## Quick answers

| What is the price of a business class ticket to Porto via Lisbon on TAP? | The fare is $1,400. |
| --- | --- |
| Why does booking through an Online Travel Agency (OTA) often fail for this itinerary? | Checkout on an OTA often fails while direct booking holds because the total includes U.S. and Portuguese taxes and carrier surcharges ticketable only on the U.S. point-of-sale. |
| Is the $1,400 Porto fare considered a true error fare that might be cancelled? | No, it tickets as a revenue-managed fare in full business inventory, unlike the $245 roundtrip fare which was cancelled and refunded. |
| What type of seat configuration is expected on the Lisbon to Porto (LIS-OPO) segment? | It is Euro-business in most cases, consisting of a standard economy seat with the middle blocked. |
| Which specific fare classes provide full Miles&Go accrual and flexible change rules? | The primary J/C/D inventory buckets provide full Miles&Go accrual and flexible change rules. |

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