More reason to bid the base you want, then the a/c you desire. In this industry, things change on a dime, and last thing you want is stuck at a base that you don't like, making your commute difficult. Most of the newhire will have years on end to fly the 767 or even the 777, so there's no real reason to bid the "higher" paid position right off the bet, unless you gotta have those 48 hours MAD layover.