US Airways and American Airlines have completed their merger.
The deal means the combined airline will overtake Delta as the biggest carrier in the world.
The new airline will have over 1,000 aircraft flying 6,700 daily flights to 330 destinations across 54 countries. It will employ 24,500 flight attendants and 12,500 pilots.
The merger will save the airlines $1bn a year within 12 months.
Over the next 24 months, the merged company will bring all aircraft into line, which chief executive Doug Parker described as "not easy".
He told ABC News: ""We have consultants on board who’ve done this with other carriers.
"It’s not easy, but…both airlines have been through a merger in the semi-recent past."
