Good advice about ‘Feeding and Watering’ your flight reservations applies this weekend. It appears that AA has loaded a large number of flight changes, with some routes being terminated or re-timed.
You can check your AA flights on aa.com by entering your reservation reference and your name.
My experience so far, is that some flight times have changed, by as much as an hour; flight times to and from LA have been extended (presumably to handle the delays that seem common at LAX), and other segments have had their times from 6 months ago reinstated.
So, if you have a booking, take a moment to make sure there are no nasty surprises.
AA tends to do odd things when it changes flight times. If you are looking at earning maximum BA Tier Points, watch out for route changes. AA thinks nothing of changing a LHR-JFK-LAX to a LHR-DFW-LAX which drops the number of Tiers points significantly. In addition, if a change drops your flight below the legal minimum connecting time, they often just drop off a segment, so you need to check that all segments continue in to exist in any bookings you have.