The man is still being questioned by investigators and will likely face charges today or tomorrow in relation to the incident, police spokesman Jean-Pierre Brabant said today. His name has not been released because no charges have been filed yet.
Police said they searched the suspect's apartment and car in a residential area near the airport yesterday evening. They seized some documents but Ian Lafreniere, another police spokesman, said they have found "nothing obvious" so far.
The package was spotted at a security checkpoint in the US departures area early yesterday morning. The items in the package were not explosives.
"It was different parts of a potential device. To make that a little clearer, let's say you are trying to do a bomb inside the luggage, but one thing was missing: no explosives, but it was different parts of a dangerous device," said Ian Lafreniere, another police spokesman.
Everyone on the flight was questioned, and luggage was searched as a precaution, Lafreniere said.
Flights leaving to the United States were delayed for several hours yesterday morning but an airport spokeswoman said flight operations had resumed by early in the afternoon.