They are historically big buyers of Boeing jets for personal use.
United had already announced plans to retire some Boeing 767-200 jets.
So far this year, a record 595 Boeing commercial jets, valued at $28 billion, have been ordered.
With the dollar's drop, he says, Boeing jets cost them about half of what they did four years ago.
Are you, by any chance, in the market for a Boeing jet fighter?
It would also have been the first crash of a Boeing jet in passenger service.
Boeing jets are one American product that foreigners can't get enough of.
Airplanes used in these operations were all Boeing 757 jets.
The airport can handle aircraft up to the size of the Boeing 747 jets.
The king also had a personal $150 million Boeing 747 jet, equipped with his own fountain.