The Irish Airline Pilots' Association has said that it is carrying out its own investigation into the bomb scare on board a Ryanair flight that was diverted to Scotland yesterday.
Captain Evan Cullen said that he had unconfirmed reports that the pilot was told not to allow passengers to disembark when the aircraft was diverted to Glasgow's Prestwick Airport.
He said that his biggest concern was why people were left on board when there was a threat to the aircraft.
Police in Scotland are continuing to investigate yesterday's incident.
More than 170 Ryanair passengers and crew arrived at Dublin Airport last night some ten hours after their flight was diverted because of the bomb scare.
The plane had been on its way from Paris to Dublin and was over British airspace when a passenger found a note in a magazine warning that a bomb was on board the aircraft.
The captain immediately alerted air traffic control which contacted security services. Three tornado jets were scrambled from the RAF's quick reaction alert force.
The UK National Air Traffic Service ordered the pilot to divert to Prestwick Airport.
Passengers included 71 girls from St Leo's College, Convent of Mercy in Co Carlow.
After getting the all-clear the plane eventually touched down at Dublin Airport shortly after 11.30pm last night.
It is not known who was responsible for the hoax bomb warning.
