Originally Posted by
JALsnipe
This isn't new - United has eticketing agreements with airlines they aren't in an alliance with. You can book AS or DL legs on 016 stock.
You won't get any benefits or mileage earnings for the non-UA legs.
I assume you'll have to pick up and recheck your bags.
No you don't need to recheck your bags. If it's one ticket AS will check it to the final destination of the ticket.