A group of students are stranded in Hong Kong by the cancellation of all flights to Britain because of the ash clouds affecting air traffic over Europe. They are hoping flights will soon resume so they can go back to school. The students, who are studying in Britain, had returned to Hong Kong for the Easter holidays. Their flights back to Britain last weekend were cancelled because of the volcano in Iceland which is sending thick ash clouds into the skies. Sixty-three thousand flights have been cancelled. Justin Leung Doy-why, 15, goes to school in Winchester. He says he is upset by the delay because he has exams to prepare for. 'This is the shortest term and we're missing half of it,' he said. 'So far this is the first week, but by the time I get on the flight it will be about two or three weeks.' His school resumed classes on Monday and he was originally booked to fly out on Sunday. The next flight he can board - if conditions have improved enough - will be on April 27, his mother Cerina said. Gilbert Lee Ho-yin, 16, is anxious to get back to school in London but must wait until May 11. 'There is a long waiting list for flights because many other people are also waiting,' he said. 'Up to 20 of my schoolmates are stranded in Hong Kong.' Monse Wong, a Form Six student at a school in in Bath, said: 'On the bright side, I can stay with my family longer.'