I stick with AA, mainly because of the convenient flights to MIA,CHI,SFO, DFW...They also have a decent structure on flights to the Carribbean (PLS, SJU, BDA etc) and up and down the east coast (RIC, ORF, DCA, etc) and now even Canada (YYZ, YUL, and even YHZ in summer) They're a big carrier in Boston! (Just don't mind flying on RJ's )