Radical Islamist cleric Abu Hamza is due to face a judge in New York.
He and four other terrorism suspects have today arrived in the U.S. after being extradited from Britain.
Abu Hamza, 54, used to preach at Finsbury Park mosque.
The radical Islamic cleric Abu Hamza has been flown to the US after judges ruled that he could be extradited on terror charges. He was one of five men to be flown out last night including Babar Ahmad from South London who is accused of running an extremist website.
South London computer expert Babar Ahmad says he will be extradited to the USA with his head held high.
Today, the High Court decided that he should be extradited to the US to face terror charges, along with radical Islamist cleric Abu Hamza and three others.
– Babar Ahmad
"Today I have lost my eight-year and two-month battle against extradition to the US. I would like to thank all those over the years who supported me and my family: lawyers, politicians, journalists and members of the public from all walks of life.
"By exposing the fallacy of the UK's extradition arrangements with the US, I leave with my head held high having won the moral victory."
– Home Office Spokesman
"We welcome the High Court decision on Abu Hamza and others."We are now working to extradite these men as quickly as possible."
Radical Islamist cleric Abu Hamza has failed in a last-ditch High Court bid to halt his extradition from the UK to the US to stand trial on terrorism charges.
Extensive delays in cases such as the extradition of radical cleric Abu Hamza are a "source of real fury", the most senior judge in England and Wales said today.
The Lord Chief Justice, Lord Judge, said any case which takes eight years through a series of legal processes and has still not come to a conclusion was "a source of real fury to me".
He was responding to a question about Hamza's extradition to the United States, which has again been put on hold pending a further hearing next week, but stressed he could not comment on any individual case.
Abu Hamza the radical cleric known for preaching hatred at the Finsbury Park Mosque has won a last-minute High Court challenge to avoid extradition to America.
Hamza is one of two terror suspects who have won an order blocking their removal.
Phil Bayles filed this report from the High Court.
Radical cleric Abu Hamza has launched a last-minute High Court challenge in a move to avoid extradition to the United States, it was confirmed today.