LHR-SFO two flights with close departure time
Departures of UA900 and UA949 (LHR-SFO) are only two hours apart and before noon. I know UA has limited slots. LHR-SFO used to have an afternoon departure around 2pm. Seems LHR-LAX now takes that slot.
Why would United schedule two SFO flights so closely? BA has two daily flights and departure is about 4 hours apart.