When I travel by airplane, space is usually at a premium, so if I bring a film camera it is usually one of the tiny cameras I got for backpacking decades ago. I've only had a few trips by plane in the last few years, business trips to Saigon and to Bologna, Italy. I took my Olympus XA to Viet Nam. I took my Minox 35GT to Bologna, only to have the shutter fail... after 30 years of faithful service. My last trip to Bologna I took the XA again, but hardly used it. It was wintertime, and my iPhone ended up being far handier.
As much as I love these tiny, comfortable old friends, I can't consider them my best cameras. I do take my best cameras with me on car trips, my Leica and my dad's old Konica. They're best transported by car, with all their lenses in their hard cases. I suppose I should try traveling lighter with those two cameras on a trip to see how it works out, but the charm with those cameras is having all the prime lenses for each.