sydney qantas jumbo jet bind san francisco force return australia saturday technical issue 90 minutes flight airline say engineer inspect boeing 747 land sydney kingsford smith airport qantas spokeswoman say decline say many people aboard injuries report understand delay frustrate passengers always put safety ahead schedule team everything get passengers back way say passengers tell flight qf 73 depart 2.10 pm local time turn back autopilot work passenger tell australia abc news flight get ridiculously bumpy seatbelt sign never get switch passenger say qantas flight san francisco turn back 'technical issue