Great fares from San Francisco, CA to Cabo San Lucas, Mexico starting at $77 Round Trip incl. taxes fees

Flyertalk discusses the amazing fare filed by American Airlines from San Francisco, CA to Cabo San Lucas, Mexico for as little as $77 Round Trip! This fare does NOT show up on ITA Matrix and aa.com for me but it shows on travelocity.com and possibly on expedia.com.

I could not find any $77 fares right now but available fare for $177 is still only about half the usual price. It's a great fare for a Mexican getaway.