An important part of the Government's immigration policy has suffered a serious blow after a leading airline announced it would no longer carry failed asylum-seekers who were being forcibly removed from the United Kingdom. XL Airways, which has a fleet of 24 aircraft, said it was opposed to the policy because it had "sympathy for all dispossessed people in the world"...British Airways and Virgin, who were contacted by The Independent, said their aircraft had been used for the purposes of escorted deportations as they were under a legal obligation to return failed asylum-seekers...But a Home Office spokesman said the Borders and Immigration Agency only contracted with airlines willing to operate removal flights.