- a strike is accepted only when the whole round trip (out to the target, then
home to a friendly airport) fits the remaining fuel, and the browser mirrors
the check so an unreachable target is refused with its distance and the
plane's effective range
- a bomber that bombs between hourly ticks turns for home at once instead of
idling and crashing on an empty tank; a plane with a runway lands on fumes
- aircraft may now target a garrison inside a hostile city: they bomb it and
turn away, and captures skip aircraft so the city is never taken
- bomber/jet endurance and mission-range tuning