Out of the three extra passengers, one person was allowed to sit in the cockpit, two other passengers were accommodated in the cabin crew area.
Allowing these extra passengers also got the door damaged and the airline was forced to offload the passengers.
The incident has brought the airliner under the scanner as it flouts the safety regulations.
The rule that no passenger is allowed to sit in the cockpit which was passed after the 9/11 attacks still holds good.
Since the safety breach falls under the criminal proceedings, DGCA is expected to take stern action against Air India.