I don't know if it's just airlines that have competition problems in the US. I actually think it's the airports that the problem. In the EU, many (most?) airpo

I don't know if it's just airlines that have competition problems in the US. I actually think it's the airports that the problem. In the EU, many (most?) airports are privately owned. In the US, they're almost always state owned. Furthermore, the Port Authority generally owns all the airports in the area. In many EU areas, that's not the case. There's 6 airports in the London area and they all compete to offer the lowest landing fees to win airlines. Ryanair capitalised on this and really injected all the competition in the market by only flying from 'secondary' airports. I'm not sure the same thing could happen in the US. There isn't the same level of competition for airports, and without that I think it's hard for any airline to really make any difference.