Hi, I have been a lurker for quite awhile. I usually only travel 1 or two times a year, so couldn't really benifit from any kind of frequent flier program. I just found out I will be traveling for my job for quite some time, 2-3 trips a month from BWI to LAX. What would be a good airline to build up miles on? I mainly fly to the UK for vacation and would probally cash in any points for a trip there.

Thanks for any and all help!