That was no BUG creamo if you came in during the frame.
We have the Fields eneabled at frame start, then they get disabled. 1 Hour into the frame we enable the fields again for re-upping. So if you died you can take off again or if you lived you can land and grab a differnt A/C. This Re-up window is about 5 mins, after that the fields are being closed again.
So if you walk on in DURING the frame, just contact the CM (usually the one guy being in the third - not used country

) and tell him you want to participate, if it's still early on he'll enable a field and plane and you can go up right away, if you're close to the re-up window he might tell you towait a few mins and take off with the second wave.
Cheers
DW6
CM