A loading platform grazed the Boeing's door on Sunday but was not reported by the ground handling agent Air Terminal Services (ATS).
The airline only became aware of the damage after the aircraft returned to Auckland and routine inspections were made.
Fiji Trades Union Congress national secretary Felix Anthony said the incident highlighted concerns around security at the airport and the safety of passengers.
"We have unqualified people who are performing duties that they really should not be performing," he said.
