I like this kind of idea.
Land ->taxi to a hangar ->complete stop->refuel
25% wait 5 sec
50% wait 10 sec
75% wait 15 sec
100% wait 20 sec
E-Tank + 10 sec
From just the point of view of Re-fuel
"waiting time"is very interesting factor for game play.
Same intercepters or defending units can re-up immediately after killed from base again and again when you attaking base.
The only way is closing. There is less meaning for fighter sweap before bomber arrive.
However this waiting time makes meanig of sweap compare of current system.
(more chanse to bring Goon, increasing of survivability without ammo and low fuel rtb, etc)
also can avoid needless vulting like blood suker

oh just joke