The passengers were allowed on the January 20 flight to Medina despite every seat being filled, the airline told the BBC.
Pakistan International Airlines is investigating how seven extra passengers were allowed to stand in the aisles on a flight to Saudi Arabia.
The passengers were allowed on the January 20 flight to Medina despite every seat being filled, the airline told the BBC.
Details of the flight have only emerged now because of extensive investigations by a newspaper in Pakistan.
Staff had issued additional handwritten boarding passes, the paper reported.
Aviation experts said the extra passengers would have compromised safety in an emergency.