This is one thing that irritates me about my job (OK, maybe not the only thing). I travel a decent amount for work. However, as a government mule, I generally have to use the GSA contract carrier for official travel because of the specially negotiated rates. There's no rhyme nor reason to who gets a given route - and they change periodically when the routes are re-negotiated. Just when I'm cruising along building miles on one carrier, the rug gets pulled out from under me.