Ron Dupas has an online collection of postcards, including a large collection with photos of airports. There are some great ones here, including the now-vanished Cartierville airport near Montreal, the TCA hangar in Vancouver in the early 60’s (my first memory of flying is looking at the pictures on the safety card in the seat pocket of a Vickers Viscount), and a shot from inside the control tower at Blatchford field in Edmonton from what looks like the late 1950s (included here).