Shouldn't be a problem....
To have been declared bankrupt does not infer any criminal activity and bankruptcies can be declared following a state of insolvency for many different reasons. I know of no airline which carries out the type of creditworthiness checks which would reveal previous or current bankruptcy. For what it's worth however, I would seriously question the wisdom of volunteering such information if specific questions were not asked in the application form(s). Good luck. bm