Empire Air Training Scheme movie

[Grant Bowker]

All I can say is that the buildings an other scenery are "typical" BCATP. There were literally dozens of standardized airfields constructed in different parts of Canada that were virtually identical. Many of the airports (both runways and buildings) are still in use with different degrees of modernisation.
I'm currently sitting at Ottawa International Airport CYOW, the last of the BCATP hangars were torn down about 2 years ago.
Within 100NM of here I can find Tyendinaga CPU6, Rockliffe CYRO, Carp CYRP Kingston CYGK, St Hubert CYHU, Arnprior CNP3 that were obviously constructed to the standard pattern. It wasn't uncommon for trainee pilots to land at the wrong airport because they were often closely spaced and all looked the same. Naturally anyone committing such a faux-pas would have a spell as SLJO.
At least part of Captain of the Clouds was shot here in Ottawa, in the area now occupied by the Ottawa Flying Club. In particular, the graduation parade and possibly other sequences.