I'm in 16F on my outbound flight. On a 737-800 that is the row behind the exit row, just my luck right. The exit row on a 757 is very nice. There is about the same amount of legroom in FC, perhaps a little less, but almost the same. Yes, I did not do my homework on this one. I should have objected when the agent said FC was full and I should have known that U is a non-upgradible fare class. Next time.