Your flight was from the U.K., where the rules are similar to those in the rest of Europe. Fortunately, you received a promise in writing from American Airlines.

American Airlines passengers can check their flight status online at aa.com or via the airline's mobile app. Flight status can be tracked by flight number or city pair. See real-time flight ...

American Airlines promises Joseph Muskovich compensation for a lengthy flight delay. But despite repeated promises, it never pays. How can he get American Airlines to honor its promise?