UA 4957 from Buffalo to Dulles, broken bleeder valve. Part won't be there until after 1:00 today 2/15/2019. Rebooked, then Rebooked due to missed connection in Dulles. Daughter in line now to rebook again, winter break on the east coast so no seats available. They are being patient, but stuff happens. I have no idea when they will make it into LAX.