I was 3 for 3 this last week. BWI - SEA with a connection in SFO. MX caused BWI-SFO to be delayed, and I missed my flight. Next open flight was following morning. Then SEA-SFO (final destination was ONT) was delayed 3 hours so they put me on another SEA-SFO but it was oversold, so I got that and then was put on AS to LAX. Then LAX-BWI also oversold so I was protected on LAX-ORD redeye with early ORD-BWI.
It's getting crazy busy on UA metal these days.