Excellent suggestion Miko but if the crew bails out, you get credit for both kills. If the crew stays with the airplane 'till its dead (thru an explosion or crash), then the gunner gets a safe landing and you only get credit for killing the pilot.
Realized this might become an issue after attacking a 300mph gunned B-17 and a Split-S'ing gunned Lancaster last night. Its bad enough that a gunner can control the airplane from any turret but to with a pilot maneuvering the airplane to its stuctural limits, a bomber attack is hazardous and difficult. Against gunned bombers with two sets of eyes that can "leave the plane" with the F3 view, most sane tactics of attack become impossible. A spitfire is a far easier airplane to kill than a gunned B-17, especially when your plane only carries machine guns.
MiG