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Interesting question. I have never had this happen, and I think I'll be asking a lot of questions if it does.

It's not something an airline can do hastily, as different aircraft (well, at least those of differing type rating) require different crews to operate. So the airline will have to grab a totally different crew to match their replacement aircraft.

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I assume it happens regularly. I had a couple of flights myself on other plans than initially advertised. I always assumed that the airline canceled/delayed other flights because of it (taking plane a and crew a from flight a to do flight b with plane a).

Before the 737 Max got grounded (after the 2nd crash), I remember reports that some airlines allowed passengers to rebook their flights for free (to end up on a different plane). I doubt they will continue doing it once the 737 Max is allowed to fly again. Eg, Southwest is too dependent on it.

When it has happened to me, the crew came with the plane.

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