I'm scheduled to be on one of these planes tomorrow, departing in less than 24 hours. I am confirmed in J, and I am a 1K. The seat map shows 4 open F seats, so I should be able to move to one of them when I check-in, right? But my first flight is on Austrian Airlines, so I can't check in using the United app, and the Austrian website gives a technical error when I try checking in there. Is there anything I can do, other than hope that there is still an F seat available when I go to the airport?