Matt, don't know if they're available in the 'States, but the old Airfix 1/72nd scale figures are still going under the Heller lable. I think they still do the following sets, all WW2:-
USAAF
RAF
Luftwaffe
Plus Modern RAF (NATO).
Each set contains around 40 figures/equipment, with aircrew, ground crew in various poses, and there are also some other parts, such as starter trolleys, in some sets. They are well moulded in hard polythene, but, with the small base of each figure removed, and with careful painting, they look very good.
I know that Model Hobbies in the UK stock them, so if you need any, and have trouble getting them in the US, let me know; I can send some from here. I've actually got a couple of figures, in hard plastic, from some of the airfield vehicle sets, so if there's anything specific you want, again let me know, and I'll see if I've got it/them.