Hipmunk integrates calendar/appointment data w/ travel searches
macworld.com
macworld.com
If I want to book a flight from NRT to SFO, it's often cheaper to fly through LAX, but the big carriers don't offer that many runs between LAX and SFO. Southwest, on the other hand, has a plane every few hours, and they're really good about rescheduling should I get stuck at customs for an insane amount of time (which is a given, because LAX).
Southwest offers a lot of flights between SFO and LAX, but it's not true that the big carriers don't. I did a search on June 25 one-way SFO-LAX. Southwest has 12 non-stops. Delta has 11, and United has 16.
They are simply too expensive. It is always cheaper to purchase thru another portal and that is unfortunate because their tool is hands down the best...