An inquiry into Transport Minister Gerry Brownlee and his deliberate breach of airport security is unlikely to be completed before the election.
Mr Brownlee and two of his officials side-stepped security in Christchurch Airport on July 24, avoiding scanning equipment by entering a gate lounge through an exit door.
He offered his resignation to Prime Minister John Key, who refused it on the basis that he had been a good minister.
The Civil Aviation Authority is investigating. The Herald understands that while Mr Brownlee has already been spoken to, several interviews still have to take place.
A report then needs to be written and reviewed. It is understood that it is unlikely to be finished before the election.