Well known you aren't afraid of dumpsters
At the risk of repeating myself ...
From time to time I read/hear people poking fun at Spirit. I think Jimmy Kimmel is guilty of it, and I suspect he doesn't fly commercial.
I don't know why people want to pay 4x as much, but obviously some do. I don't see why I should subsidize people who can't read good.
I fly fairly often, among various airlines. The least comfortable airline is Southwest, hands down. The seats are packed together just as tightly, but they also recline (which Spirit and Frontier do not). The cattle call is embarrassing. Trying to explain to idiots that my number beats theirs because I hovered over my browser 24-hours before departure time. The race for the "good" seats.
I've had good experiences on the Delta Shuttle, but I've had lousy experiences on the Delta Shuttle. Sometimes you get the plane with no middle seats, sometimes you don't.
United is the second worst. Why did they think I'd want a TV and phone jammed in my face in 2018? Or 2008 for that matter?
American can be useful if you need to hub-n-spoke it to some underserved regional backwater. I almost never fly it even though/because it's the only option in my home town.
I flew Norwegian and easyJet on my European trip in August. I thought easyJet was fine.
Norwegian economy was good enough for an overnight. (Maybe it was harder on Piper. He's taller than I am.) I took the Premium service on my return from Copenhagen to JFK. It wasn't worth the extra money. I slept well on both legs. Only the wine was free (not liquor) in Premium, and they didn't give it to us when we first got on. We had to get airborne first (a terrible policy).
I've never flown JetBlue. I'm not sure I would trust Allegiant. I aspire to Emirates, but I'm not going that way as far as I know.
I like Megabus. I pay a dollar per ride. I did the Chicago-NYC a couple of times, but because I can fly Spirit for about $30, I usually pay 30x more than I have to. 16 hours is a long time when you've already passed all the scenery a couple of times.