[x] Payload minimum check, higher values are always accepted
[x] Fuel check with only warnings, but not requirement, low warning, high charge for it
[x] Real-time clock only as a bonus, changing it should not abort tracking, changing it by more than X minutes disables bonus, a few seconds change should be ignored in case physics engine slowed down
Similar with resuming flight:
[x] Payload just minimum check
[x] Fuel this time only a range up or down, but percentage based and not so strict
[x] Location radius increased by a bit / depending on aircraft type?
Similar with resuming flight: