FlightAware seems to have lost track of UA927. UA927 is FRA-SFO, then 2 or 3
hours later on a different aircraft, different gate, becomes a domestic SFO-LAX
flight.
FlightAware just shows the FRA-SFO part and does not list the SFO-LAX anywhere.
I have to go to flytecomm to get info on the SFO-LAX portion.
Welcome to the forum! 
flightaware.com/live/flight/UAL927
Airlines often have a flight number continue on to another flight. (Dami, you can take over from here.)
flightaware.com/live/flight/NWA1480
I was on the MSO-MSP leg.
flightaware.com/live/flight/UAL927/history
Shows FRA-SFO and SFO-LAX flights every day.