I fly American when I can because they have extra legroom on their planes. When you’re 6’2", this is really important. If I must fly another airline, I’ll try to get an exit row seat for the same reason. I’d say being comfortable is worth paying an extra $20 or $30 bucks for.
Alaska Airlines also has lots of legroom, and you can get dirt-cheap non-stop flights from Reagan National Airport (DCA) to LAX if you buy early enough. Plus, they actually served me a legitimate MEAL on my flight. It was hot and had utensils and didn’t taste like crap! It also included a prayer card; I’m not a praying man, but I sure do appreciate the thought. 
In fact, just about any airline that offers a lot of flights out of DCA is preferable to me, because it’s on a subway line, while Dulles and BWI are a pain in the ass to get to.
I will not, ever again, under any circumstance, fly Independence Air. They lost my luggage both on the way to and from Boston, and on the flight to Boston, they had to ask a passenger to help pick up trash from other passengers, because they were low on crew members. During this, they kept reminding us that they were professionals and knew what they were doing. An incompetent airline is one thing, but an insecure one is 10 times worse.