"As for the UA blaming--there was probably tons of double booking from UA pax"
I agree. I am double/triple+ booking every flight on every airline right now. Today, UA cancelled my 8:00 AM flight at 9:00 AM. Next UA flight 4:40PM. Walked to AA got my FC seat and was at my destination only 1.5 hrs late. AA was totally sold out by the time UA cancelled BTW.