Now that I am remembering more, I remember I was on a J award SEA-ORD-BOS to check out universities, this was around spring break-ish time, I believe, would have been in the early 2000s. ORD-BOS was scheduled on a 757, but after I arrived in ORD, there was a bit of chaos at the gate, as the aircraft seemed to have a last minute switch to a 767. I assume GAs were massively scrambling to re-allocate seats - I remained in my row 2 assignment, which on the '67 was in F. Was a pretty good flight.