I now use a compact digital. A "tough" camera, used often in movie mode. Always available.
Long ago, I used an Olympus OM1n, non automatic, 35mm, with 35-70 lens, shooting out of the open Cessna window or Pa28 panel.
Zoom often is poorer than wider angle and enlargement, due to aircraft instability.
Ability to choose slow shutter speed is essential, if shooting through prop.
Also ability to switch off image stabilisation, and autofocus.