Specifically, flight 916, there might be others.
I'm scheduled to fly it a month today, and happened to notice the upgrade. Is this just for the summer, or part of the overall transition from 772s to 744s, given the lower lease/operating cost rates for UA with the 744?
Anyhow, while I'm disappointed my first flight on a 777 is delayed, I will get to experience my first trip on a 744! And there's no better airline, either!