I think I mentioned this in the GP comment, but that's exactly what I did recently. I booked a flight scheduled to be on Airbus planes but there's no guarantee

I think I mentioned this in the GP comment, but that's exactly what I did recently. I booked a flight scheduled to be on Airbus planes but there's no guarantee there. Mt return flight was changed after I booked to be on Boeing planes. Booking a ticket is just a commitment for them to get you to/from specific destinations on time, if possible. Showing the plane scheduled for the flight is helpful for picking seats but its definitely no guarantee. My wife actually got stuck in DC over night once when they decided they wanted to use a smaller plane. No mechanical issues, I assume they just needed to move the plane for the first flight the next morning and they decided to bump a few passengers off the flight.