Originally Posted by
ExAAerOnDL
As to the second question, the seat map is horribly unreliable. Looking at your example, your odds of an op-up are basically zero. Premium cabin (J/D/S/I) is zeroed out in all inventories, so it's full. Looking at the Economy cabin (Y and below), that tells me that there are at least 7 seats available (Y7), but not many more (since B/M are down to 5). I would guess 7-10 seats in coach.
This is an AA/DL difference—AA shows inventory up to 7, but DL shows it up to 9.
In other words a flight with 100 open seats on AA will show Y7, whereas a flight on DL with 100 open seats will show Y9.
In this case, that means that DL is selling exactly 7 seats. On an international flight, I'd be surprised if it wasn't overbooked by a few already.