Air Transat flights
The Canadian airline Air Transat operates both scheduled and charter flights, and has a total of about 70 destinations in Europe and North America. Air Transat has its main hub located at Montréal–Trudeau International Airport. They are not a part of either of the major global airline alliances.
An airline hub is an airport where the airline has a heavy presence and normally some kind of headquarters. On the other hand, a focus city is a destination where the airline operates limited point-to-point routes. In these cities, the airline doesn’t necessarily need to have an office (even though this sometimes is the case). Many low-cost airlines don't use the definition 'hub' but instead define their main airports of operations as an operating base.
CALLSIGN: AIR TRANSAT
IATA Code: TS
ICAO Code: TSC