OMG hahahha if I actually tell my whole stories (yes, there's multiple stories with multiple different airlines), I'd fill up a whole page easily! Don't even get me started... But anyways, to sum up:
Northwest: Flew them both domestically and internationally, and haven't had any problems with them at all -- decent food, decent pricing, even had silver frequent flyer with them 2 years in a row once and got multiple free upgrades to first class on domestic flights. Though these all were from 2-3 years ago before their bancruptcy, now they don't even seem to offer free meals anymore to economy pricing. We'll see.
American Airlines: never had any good experience with them
(( Extreme delays, lost my reservation (made me miss my flight and my connecting flight since they cant find my name on the system inside -- but my name was on the system outside, the ones before the security areas), lost my luggage...
Southwest: HAHAHAHA what can I say, I was soooo confused that they don't have assigned seats, but that was the least of their problems! I was flying in the evening from PHL to SFO and there were EXTREME delays, and in the end I ended up catching the flight from PHL to Oakland instead! And arrived 3 hours later than schedule (3am instead of midnight). My poor bf got sooooo confused trying to pick me up at the airport!
Air France: thought everything was good, until I arrived to my transit at CDG paris and found out that my connecting flight to PHL has been cancelled. Ended up stranded in CDG for 12-15 hours (forgot exactly how long, but after 10 hours of no real food at the airport, everything seems blurry), and was put into a flight to Washington, DC instead! Uhhhhh...
United: flewn with them a couple times, cheap last minute rate from SFO to LAX, ok service, no problems so far.
Let's see what else... I can't remember other airlines I flew with, so I guess that's it for now