Had one ride on 747. It was an equipment swap from a 757 ORD-DEN. Guessing equipment repostioning. Can't remember year but when they were battleship grey.
Remember had originally upgraded with the 500 mile paper certs. on 757. When they swap planes ended up with UD seat. (back then they were not lie-flat but cool anyway)
Before the meal they had these hot candied walnuts. Only time I have every had them. On all other planes was always just hot mixed nuts.