Friends of mine flying ZRH - LHR - IAD - MIA on Christmas signed in to their AAdvantage account and saw that their flight legs LHR - IAD and IAD - MIA got cancelled without notice. They called up the German American Airlines customer support and they were like "yeah I can see it in the system that there hasn't been sent out any information to you regarding the issue", over a month after it had already been cancelled. They said the flight had been cancelled because of being unconfirmed even though the money had been deducted right away. They had booked directly on the american airlines site so no third party was involved. The good side is that they got rebooked into Y fyling LHR - DFW - MIA while before they were in Q on the legs LHR - IAD and IAD - MIA, but now their layover is only 2 hours 10 minutes insted of 3h 40 minutes they had before. I honestly don't think that rerouting them, even if it's in Y, makes up for it at all. They only saw the flight was cancelled accidentally because they wanted to look into their flight status. Had they just flown to LHR they would have just been there wondering what the heck happened and they don't have a connecting flight anymore. Shouldn't they get reimbursed differently? Like miles or an upgrade at least?