Porter Airlines flights
Porter Airlines is a Canadian regional airline that mainly offers domestic connections, even if they also have some destinations in the US. The airline has its headquarters at Billy Bishop Toronto City Airport, while they also have additional hubs at Toronto Pearson International Airport and Ottawa Macdonald–Cartier International Airport.
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.
IATA Code: PD
ICAO Code: KZZV