Thousands of air passengers have returned to the UK after a six-day flight ban caused by volcanic ash.
Others remain stranded overseas, however, and travel companies think it may take weeks to repatriate everybody.
Despite the large backlog, London's Heathrow Airport has begun operating at 90% normal service, with other airports and airlines following its lead.
Transport Secretary Lord Adonis has said the ban was "too cautious" while some airlines want compensation.
John Moylan reports.
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