Yes sir ! Well done.
It is indeed Helena Municipal Airport, Helena, Montana.
Helena, the State Capital of Montana. This photograph was taken in 1940.
Apart from a visit from Charles Lindbergh in Sept. 5/9th 1927 when he was on the Grand Tour after crossing the pond and a quick stop on the night of Nov. 3rd 1938 by Mrs Franklin D Roosevelt who was en route to Seattle, nothing else seems to have happened here.
Over to you.
Tack.