Definitely Humpty's for me. Awesome nightly train wrecks to watch and/or participate in. I woke up late for the van once at 4:30...PM.
The 717 was a fond memory as well. Easy automation, almost to the point of boredom. PROF actually did its job with accuracy. If the runway was visible off the nose your chances of landing on that runway were 99%. The 73 is MUCH easier to land smoothly (consistently) though.
The biggest thing, I guess, were the people. Most everyone being based together meant you knew each other, and I'm not just talking about first names. Lots of great times were spent with co-workers outside of work as well, especially if you lived in "base housing" or near the city.
An original SWA flight attendant asked me how I knew so many crew members in the terminal, having been on the property for such a short amount of time? I answered, because we were a family, dysfunctional and great, all at the same time. That was my experience anyway. Everyone takes away something different, but in my opinion, Southwest lucked into a helluva great group of people to work with. From my short tenure at SWA, I think the AirTran peeps lucked into a similar group as well. [emoji482]