Secretary of Defense Pete Hegseth accepted the $US400 million ($A621 million) Boeing-made jet for use as US President Donald Trump's official plane, the Pentagon said.
Pentagon spokesman Sean Parnell said the Defense Department "will work to ensure proper security measures and functional-mission requirements are considered".
He added that the plane was accepted "in accordance with all federal rules and regulations".
Legal experts have questioned the scope of laws relating to gifts from foreign governments that aim to thwart corruption and improper influence.
Democrats have also sought to block the handover.
Qatar has dismissed concerns about the aircraft deal.
Trump has also shrugged off ethical concerns, saying it would be "stupid" not to accept the jet.
He has defended it as a way to save tax dollars.
"Why should our military, and therefore our taxpayers, be forced to pay hundreds of millions of dollars when they can get it for FREE," Trump posted on his social media site.
Experts say that retrofitting the luxury plane offered by Qatar's royal family will require significant security upgrades, communications improvements to prevent spies from listening in, and the ability to fend off incoming missiles.
That could cost hundreds of millions of dollars.
With AAP.
