Peter Duniho writes:

It was always possible, of course, for a pilot to bring their own
camera to allow the passengers to use if they didn't have one of their own.
But a digital camera not only doesn't involve any additional cost in film or
processing, but the photos can be easily given to the passenger the same day
as the flight, if not immediately after.

How? By handing them the memory cards?

With film, you can just hand them the roll of film for them to develop
and print. Also, with film, there's no question of you keeping a copy
for yourself, which may be good or bad, depending on what your
passengers prefer.

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