So, yeah, I fly Southwest. It's easiest to get to Jacksonville from Miami that way. It's also not ridiculously expensive for a last minute flight. $250 for a round-trip on one day's notice is not bad at all.
Overheard during pre-flight:
Flight attendant: Can I get you a drink?
Passenger: (Quiet mumbles)
FA: Are you kidding? This is a cheap airline. We don't have that. (Please read this in snooty tone.)
Me: uncontrollable giggles. Not at all assisted by the fact that in a three seat row, I am accompanied by two gentlemen who should have purchased two seats. Thank goodness the flight was less than 90 minutes.