Give each player a personal hangar.
In this "hangar" they get x number of each plane(The max being set for each plane, i.e. you may have a max of 5 spit9s, but 25spit1s) which would be resupplied every y minutes(The resupply times also set per plane, and affected by the current strat, possibly plane factories, some conglomerate of what we have, whatever)
When you die in a plane, you lose a plane from your hangar. When you run out of that plane, it becomes a perk plane, again with the cost set per-plane.
This has the potential to give usefull attrition, without having other players incompetence affect whats available to you.