In the USAF
your pay as an officer is soley based upon your grade. Certain jobs (including Pilots) have extra pay because of the type of job, IE
Flight pay for pilots, that is based on experience/duty requirements (years qualified/how often you fly a desk). On top of this, if the individual decides to sign a contract for an extended commitment (ie 10 years) they receive a bonus that is broken up across the time. So Pilot pay in the USAF
Base pay for Grade (Rank) + Flight pay (based on years qualified) + Bonus for commitment time.
It doesn't matter what you fly, as long as you are rated. The rank does not determine you aviation rating, but experience does, thus time=promotion (for most) and thus you generally find 2nd/1st Lt. and young Cpt's as co-pilot; Captain / young Majors as MWS (Major Weapons System, anything established as an operational entity, not soley for training) A/C (Aircraft Commander); and older Cpt's and Majors as Instructor and Evaluator pilots. Above Major, the flight pay is reduced, as the Officer is required to be more and more of a desk jockey, and they attach Chief of xxxx to their name. By the rank of Colonel, your pretty much useless as an aviator, fly pay is next to nil, your way past bonus pay, so your back to just base pay, which is a nice chunk of money any way, because your a Colonel.
Hope it helps;