The men were detained at Glasgow Airport shortly before they were due to fly to Canada
Two pilots were arrested in Scotland yesterday on suspicion of being under the influence of alcohol shortly before they were due to take off for a transatlantic flight.
The Air Transat A310 had up to 250 people on board and was due to depart for Toronto, Canada.
Concerns over the pair's behaviour were raised at Glasgow Airport yesterday afternoon before departure.
The men aged 37 and 39 were subsequently arrested on suspicion of being "impaired through alcohol" and will appear in custody at Paisley Sheriff Court later.
The Canadian airline confirmed the arrests and said passengers had been put up in hotels while alternative flights were arranged.
A spokesman said: "Air Transat has learned of the arrest on July 18th of two crew members assigned to its Glasgow-Toronto flight.
"We will await the results of the investigation and judicial proceedings before commenting on the matter before making any further comments.
"The safety of our crews and passengers is, and will remain, a top priority at Air Transat."
Passengers who complained on social media about being delayed were told by the airline: "For operational reasons we have no choice."
A rescheduled flight is expected to leave this afternoon.
Additional reporting by IRN