Booking 2 overlapping flights on a last leg (to merge)
I bought a return J flight with AA from ARN-MIA-ARN; the last flight of the return segment being HEL-ARN on AY metal. Can I skip that last leg and buy another AY flight (intra EU) leaving from HEL 10 min later than the HEL-ARN flight or will that auto-cancel? If yes, will it help if I don't add any FF# info? There is a huge price difference when putting the other city on the existing booking, even in Q. Thanks for any insights.