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I haven’t done it in decades, so I don’t know if it’s changed, but there used to be an option called flying standby. You’d buy a ticket without a seat assigned, and you’d just go to the gate and wait to see if a flight went to your destination with an empty seat you could claim. It was cheaper, but no guarantee of getting a flight.
I grew up where we did casserole instead of hotdish, but that looks like it’s rice, celery, carrot, onion, and canned cream of mushroom soup.