https://www.siliconvalley.com/2023/06/19/travel-troubleshooter-american-airlines-changed-my-flight-can-i-get-my-money-back/

DEAR TRAVEL TROUBLESHOOTER: We are taking a cruise next month from Miami. I booked an 11:30 a.m. return flight from Miami to Chicago on American Airlines.

A few months before our cruise, American Airlines canceled our 11:30 a.m. flight and moved us to a 9 a.m. flight. We will still be on the ship at 9 a.m.