Originally Posted by SanDiego1K

I, too, am on the upper deck of my LH flight. I find it reassuring to look at the LH portion of my trip using my LH PNR on checkmytrip.com. It shows my seats.

Originally Posted by channa

Yes, United is not authoritative for OAL seats. Ignore what it says. They also have bugs if you booked 2 pax on the same PNR -- the OAL kicks back both seats, but CO's systems only show one.

The authoritative source would be checking it at lufthansa.com. Checkmytrip.com works too since LH uses Amadeus.