Originally Posted by bobbybrown

This is indeed a good news. Here's the steps for those booked Asiana flight using UA (or other) miles.

For all award trips, "Find my trip" doesn't work.
Select "Check-in" and fill the information. But not through the check-in button at the bottom of the first page. Go through "BOOK" at the top bar and then click "check-in". https://flyasiana.com/I/US/EN/CheckIn.do#none
It won't allow check-in because your travel date is too far away. But it lets us to select seats !!
Remember: between 72 and 48 hours before each flight, all good seats (front Y) are open.