American introduces round-trip flight check-in

American has started letting customers check in at the same time for both the departure and return segments of round-trip flights when the return segment occurs within 24 hours of the departure.

Flyers can check in online at

American's website

. The benefit here, in addition to being a time-saver, is that it could put passengers who take advantage of the new feature in a better position to get an upgrade or a standby flight.