Not SW-specific, but air travel generally:
- Climate change: carbon footprint nearly 44% greater than a single occupancy vehicle but multiplied over thousands of miles
- Monetized misery with short seat pitches, junk fees, and preferential treatment with $$$
- Inconsistent, sometimes terrible customer service (About 10 years ago, I was stuck at Heathrow but Virgin Atlantic once showed me how to and let me use their booking terminal directly to find a flight on any carrier. They definitely had customer service.)
- Regular inconveniences like endless gate changes (AA pulled this 11x in 6 hours to me at DFW)
- Sketchy maintenance practices like offshoring MRO
- Close calls and ATC shortage