The OP's post is kinda null, but it is interesting how different planes appear in different routes. Last Thu I had an 11something AM flight MCO-EWR. (all single aisle planes.) I arrived my usual hour and a half early and spotted a 764 at another gate replacing a 738 to EWR. Had a nice conversation with the GA. Apparently she was as amused as I was by that fact and she said, that it just came here yesterday and they don't know why and it is going up North now. I asked if I can standby and board that bird (was empty) and she said that not for F, because they had not boarded enough food (a reasonable reason.) So I boarded my scheduled 752 45 minutes later.

Plane changes happen... And I am sure that some E- folks had a blast in that flight