RustyC

I'll also say it depends. Spirit, for example, can get thrown off on on-time performance, especially on evening flights, because they schedule so tight that any disruption will delay later flights (there's not much cushion built in to absorb that).

Baggage policy could be different (a full carry-on with the legacy, vs. half that or less), and *maybe* miles are a sweetener, though DL and UA have been determined to stamp that out. Getting to maybe pick your own seat for free also helps. The connection time, of course, would need to be reasonable, and any RJs would be a negative.