Originally Posted by
fairviewroad
Not all airlines have the foresight to grab the most intuitive URL for their name (American, for instance, is in the same boat as Frontier). But most have (United, Delta, Southwest, Spirit, US Airways, Allegiant, etc.)
Just a wild guess that most of them had to pay early domain name claim jumpers for those rights. It was a really lucrative field not so many years ago.
Not so much now as a registrar when it comes down to a fight has to have actual use for the name rather than the formerly speculative.