The return of the 737 MAX is like every other delay on American Airlines. You show up at the gate before scheduled departure time, because the flight board says you’re leaving on time. But there’s no aircraft at the gate, so that’s impossible.
The plane pulls up, passengers flood out into the terminal, and you stand there waiting. American updates your new departure time, but it isn’t until after that time passes that the departure time gets updated again. You have a mechanical delay and American keeps pushing your scheduled departure out 10 minutes at a time, updating with a new time only after the last one passes.