Australia's national airline Qantas's last Boeing 747 passenger jumbo jet takes off in Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet prepares to take off in Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet prepares to take off in Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet flies out from Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet flies out from Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet receives a water cannon salute as it prepares to take off in Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet prepares to take off in Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)

Australia's national airline Qantas's last Boeing 747 passenger jumbo jet flies out from Sydney, Australia, on July 22, 2020. Qantas's Boeing 747 took farewell tour as flight QF7474 departed from Australia for the final time on Wednesday. (Xinhua/Bai Xuefei)