Originally Posted by
3Cforme
Does AA catch these errors immediately? It doesn't even ticket immediately - purchases go into queues to be ticketed 2-24 hours later. Delta does ticket immediately. It's been a long time since I've had duplicate Delta reservations but I recall an overnight batch check.
Yep—AA's res system won't create a second PNR at all if it conflicts with one already booked.
Catching duplicates doesn't and shouldn't have anything to do with ticket issuance–it's about holding the space, not about tickets you may or may not have for reserved space. Think about a situation where a corporate travel agent is allowed to hold space indefinitely without ticketing; you still wouldn't be allowed to hold conflicting reservations.