I think they should set it up that when the GVers pickup and use the supplies that they would have to wait an additional 2-3 minutes to simulate the repairs.
The 30 seconds on the rearm pad simulates the refueling, a repair to a damaged plane would have to be much longer. Most people wouldn't want to set on the pad for 5-10 minutes while there plane is repaired.
After all, your already at the field, and planes are free! oh ya, there's that "scoring" thing that so many worry about
