The judge also rejected an argument that Trinidadian suspect Kareem Ibrahim was medically unfit to be sent to the US for trial because he suffers from diabetes and claustrophobia.
Ibrahim was arrested, along with Guyanese suspects Abdul Kadir and Abdel Nur, in June last year and the men have been fighting extradition since.
A US indictment charges the men with conspiring to "cause death, serious bodily injury and extensive destruction'' at the airport.
The three men, along with the US citizen, are alleged to have made trips to the airport, taken video footage and photographs, drawn diagrams and collected information in preparation for the attack, court documents charge.
The documents say the men sought the help of Jamaat al Muslimeen, a Muslim organisation based in Trinidad.
The group staged a coup attempt in 1990, storming the Trinidad parliament building and taking the prime minister hostage.
However, the men have denied the US plot charges, and some officials have questioned whether the alleged attack could realistically have been carried out.