Yes. I agree. But IMHO Kesselring may not have anything in common with the shots. In the last pic we can notice that all the German planes there have the Nazi marking on the tail that was used from 1933 to the winter 1938/1939 at the latest . The Fall Gelb was in 1940 so that's be the time rather. I would say that's the 1935-1937 period. The two first seem to be taken later judging by the markings although the first one may be the pre-war one too.