I meant immaterial to the passenger, not immaterial in absoluteness. If the airline changed the flight number but still flew the same passengers to the same des

I meant immaterial to the passenger, not immaterial in absoluteness. If the airline changed the flight number but still flew the same passengers to the same destination at the same time, you wouldn't say the flight has gotten canceled, right? I'm saying caring about the flight number is breaking the abstraction relevant to the passenger. The passenger isn't purchasing a flight number; he's purchasing a flight. What matters to the passenger is that the flight happens, not that a flight with a particular number happens.