Qantas , which has its headquarters in Sydney , is the second-oldest airline in the world , and marked its 90th anniversary last year . PA : Airlines says all flights are operating on time . NEW : The majority of domestic passengers will be back by early Tuesday afternoon , the airline said . Some 100,000 passengers were affected by the grounding of Qantas flights .
PA : Airlines says all flights are operating on time . NEW : The majority of domestic passengers will be back by early Tuesday afternoon , the airline said . Some 100,000 passengers were affected by the grounding of Qantas flights .