Two strictly Orthodox men who were seriously injured in a car crash in Hungary were due to be flown back to the UK this week.
Yeshiva students Yehuda Roittenbarg and Benjamin Cohen, from Stamford Hill, north London, were said to be in a critical condition after their car crashed into a lorry on Wednesday last week.
The men, aged 19 and 20, were brought out of their induced comas on Monday after being treated at a hospital in the north-eastern city of Miskolc.
They were due to be flown back to the UK by private jet on Thursday and immediately transported to a central London hospital.
The jet, with medical equipment and doctors on board, was paid for by donors to an appeal launched on Tuesday by community member Rach Gluck.
The two students were among thousands of Charedim who had travelled to pray at the tomb of Rabbi Yeshaya Steiner of Kerestir, who is buried in the Hungarian town of Bodrogkeresztúr.
The pair were in a black Ford vehicle driving away from the tomb when the accident took place. The cause of the crash has not been confirmed.
Ms Gluck said: "The boys need urgent medical care which the Hungarian hospital is not equipped to adequately provide."