Local knowledge wins out! If it wasn't Banff, Jasper was the next logical choice. The picture has an interesting history:
The peak clipped off on the left of the picture is Morro Peak, just to the north of the present day Jasper airfield and on the east side of the Athabasca River valley, that is followed by the Yellowhead Highway and the CNR tracks.
Two US Army DH-4Bs landed at Jasper in 1920. They were part of a US Army expedition to Alaska and back.
Military aircraft began flying in Alaska in 1920 when the Black Wolf Squadron, or The Alaska Flying Expedition, made The New York to Nome Flight. Capt. St. Clair Street commanded 7 men in 4 DH-4s as they took off from Mitchel Field on 17 July 1920. Each plane had a black profile of a Wolf's head painted on their sides. The trip organizer, Billy Mitchell wanted to establish an airway to Alaska and Asia. The 9349 mile round trip route included flying west to North Dakota, then north through Saskatchewan, Alberta, British Columbia, the Yukon, and onwards to Fairbanks on 19 Aug. and finally Nome on the 23rd. They started their return trip on the 31st, landing Mitchel Field on 20 Oct. 1920 after 112 flying hours.
https://en.wikipedia.org/wiki/Eleventh_Air_Force
Capt. St. Clair Streett (at left) with pilots of the 1920 Alaskan Flying Expedition:
More information in a book blurb here:
https://www.windcanyonbooks.com/resl...roducts_id=343
evansb has control.