I normally fly B6, but had some United Credit I needed to use so booked BUF-EWR for last Monday. Sunday night get an email that our flight is Cancelled.
UA3432 Mon, Jun 27, 2022 and no flights till Tuesday. But we are near airport so they get us on 3438 on Sunday that is schedule for 7:39, it's delayed till 8:33, then lands at 9:56, and takes over an hour to wander over to the gate, getting to the gate at 11:14, then another 15 minutes to get the jetbridge fixed..
1. Could someone help me determine the reason for the initial cancelation, and subsequent delays that too a 1.5-2 hour flight to a 5+ hour orderal, united's fault? They seem to just blame everything on ATC nowadays. I am out a hotel night in NYC that I had to book last minutes so that was fun and want to have all my facts straight in my letter to them.

Thanks