Last month (Jan. 19th), I was suppose to fly from DEN-ORD on a 777 (used 2 e500s for an upgrade to business) and they swapped us to a 747 so my upgrade ended up landing me upstairs in exit row 15...not a bad use of 2 e500s

When I got off the plane in ORD, I noticed they were using the same 747 for the ORD-SFO flight and I'm assuming that was a swap since they don't use 747s (to my knowledge) on ORD-SFO