SEA-ORD redeye on a CR1. Flight was F1. Cleared 6 hours out. Flight was then F0.
(I think that was stupid, because someone easily could have had an emergency and taken the last seat with $$, but I was happy with my 6B.)
At 6 hours out, is that past the 24 hour mark when it goes to DM or can you still be auto-upgraded from the DM list? Just wonder how many people print boarding passes at 24 hours and don't find out they're in first til they start to board...