Arabella Arkwright, who posted a photograph of the punch on Twitter, at first identified the worker as an EasyJet employee.
The incident happened as the un-named British passenger in his late 20's had presumably complained about the long delay in boarding the flight, when suddenly he was struck by a Nice airport worker.
A photograph was circulated online following the alleged attack which occurred while passengers flying to Luton were delayed for several hours at the French airport.
A fellow traveller told The Telegraph that the couple were clearly annoyed but were "not threatening" the staffer, who was said to completely overreact by striking out at the man, who was holding a nine-month-old baby.
Ms Arkwright said her husband pulled the man off the passenger and "frogmarched" him away before police were alerted.
Samsic said the employee had been suspended, Guitard said.
The frustrated passenger, obscured from view by other passengers, was holding a baby when the employee lashed out at him.
The passenger had complained to the worker about the lengthy delay for his flight to the United Kingdom on budget airline EasyJet, Jean-François Guitard, a director at Nice Airport told CNN.
"A British father in his late 20's [with a] baby [in his arms] told an airport worker [he'd] had a 'terrible day", the Mail says.
The worker was ultimately discovered not to be an employee of easyJet or of Nice Airport, but instead, was a contracted hire of Samsic by the higher-ups at Nice. We apologize strongly about this situation regarding this passenger. "There is no reason for a staff member to fight a passenger", Guitard said.
"We are urgently taking this up with Nice Airport and their special assistance provider Samsic who we understand the person photographed works for".
Easyjet said the delay was due to a technical fault and that a replacement aircraft had to be sent from London Gatwick. Another aircraft had to be flown over from London.
"Passengers were provided with updates and refreshment vouchers during this time and the flight landed in London Luton last night", the airline said.