Check Bid inflight before delete expired bid

[Sovereign]

Hello

I want to delete expired bids per Crone Job. 

Is here a way to check if a pilot is inflight with the current bid? i Want so set the expired time to 2 or 3 hours but when the bid will be deleted, the flight is avaible for other pilots even if currently the pilot is still flying.

I have tried to check the acarsdata table, but here is no unique id that has a reference to the bid.

phpvms version is 5.5.

Best regards,
Jan Grimm