I had many 5 min changes. I don't bother calling them for this kind of a small stuff. On the other hand, I called them for a flight change. UAXXX was doing PHL-ORD-SEA with a single flight number and same equipment but they changed it to UAXXX departing Philly the same time and UAYYY with the identical departure time from ORD.

I just wanted to confirm that I was able to keep the good seats.