The operator of XL airlines, XL Leisure Group, which is the UK's third largest holiday group, has gone into administration.XL, which flies to 50 destinations predominantly in the Mediterranean, has rendered up to 85,000 Britons stranded abroad as all its flights have been cancelled and its aircraft grounded.It is expected that Kroll, the insolvency specialist, will be appointed to handle the administration. The Civil Aviation Authority (CAA) are currently making arrangements to bring the stranded holiday makers home on substitute planes. The 200,000 customers who have made advance bookings with the company can expect refunds. However, the minority of customers who booked directly with the airline or XL.com will have to pay a fee.