DWAGENT

I don't know the odds, and I assume it's low, but you know that old saying..."when you least expect it..."

And you're right--if I DID happen to get upgraded, I'm sure I could swap with someone...but I'm not sure I would be able to swap back to the same seat that I had originally.

Yes, you understood my intent perfectly--I do not want to be upgraded under any circumstances, I would prefer to keep the seat that I selected during booking (in economy class--over a first class seat, business class, or even in a different economy section).