The United States Department of Homeland Security (DHS) on Tuesday denied US landing rights for a charter plane carrying more than 100 Americans and US green card holders evacuated from Afghanistan, organisers of the flight said.
"They will not allow a charter on an international flight into a US port of entry," Mr Bryan Stern, a founder of non-profit group Project Dynamo, said of the department's Customs and Border Protection agency.
Mr Stern spoke to Reuters from aboard a plane his group chartered from Kam Air, a private Afghan airline that he said had been sitting for 14 hours at Abu Dhabi airport after arriving from Kabul with 117 people, including 59 children.
His group is one of several that emerged from ad hoc networks of US military veterans, current and former US officials and others that formed to bolster last month's US evacuation operation they saw as chaotic and badly organised. DHS did not immediately respond to a request for comment.
An administration official, speaking on condition of anonymity, said they were unfamiliar with the matter, but that the US government typically takes time to verify the manifests of charter planes before clearing them to land in the US.
US President Joe Biden's administration has said its top priority is repatriating Americans and green card holders unable to leave Afghanistan in the US evacuation operation last month.
A senior State Department official on Monday said the US was aware of about 100 American citizens and legal permanent residents ready to leave Afghanistan.
Twenty-eight Americans, 83 green card holders and six people with US Special Immigration Visas granted to Afghans who worked for the US government during the 20-year war in Afghanistan were aboard the Kam Air flight, Mr Stern said.
He had planned to transfer the passengers to a chartered Ethiopian Airlines plane for an onward flight to the US that he said the Customs cleared to land at John F. Kennedy International Airport in New York City.
Customs then changed the clearance to Dulles International Airport outside Washington before denying the plane landing rights anywhere in the US, he said.
"I have a big, beautiful, giant, humongous Boeing 787 that I can see parked in front of us," he said. "I have crew. I have food."
Mr Stern said intermediaries in Kabul had obtained permission from the Taliban-run Afghan Civil Aviation Authority for the groups to send a charter flight to retrieve the passengers from Kabul airport.