FOUR Thomas Cook planes have been seized as security for unpaid bills after the tour giant collapsed, it has been reported  Notices taped by Glasgow Airport could be seen on the planes’ doors as they stood parked on the apron, following the demise of the company  Glasgow Airport confirmed that the planes have been seized under regulations which permit airports to detain aircraft “as security against a range of charges incurred including air traffic charges”  “This is happening across the UK where Thomas Cook aircraft are based,” said a spokesman  The last scheduled Thomas Cook flight arrived in Glasgow – from Orlando in Florida – at 5 50am on Monday.  An airport source said heartbroken staff cried as the plane touched down in Scotland  Nathan Willock, an engineer with Thomas Cook, branded it a “sad day in aviation” as he filmed the Orlando flight touch down on the runway, hours after the company was declared insolvent  The Civil Aviation Authority launched the UK’s largest peacetime repatriation on Monday, bringing 14,700 Thomas Cook customers home on 64 flights UNPAID DEBTS  That was 95 per cent of the holidaymakers who were originally booked to fly home on that day  A further 135,000 passengers are expected to be brought back on rescue flights over the next 13 days, including 16,800 on 74 flights on Tuesday  The operation is expected to cost approximately £100 million.  Thomas Cook’s demise in the early hours of Monday morning means around 9,000 UK workers face being out of work  The world’s oldest travel firm, which had been operating for 178 years, was unable to secure a rescue deal after failing to pay the £200million bill it owed to creditors  The tour operator has fallen victim to multiple setbacks including changing travel habits and the rise of online booking sites  It was also hit by the sinking pound and unusually hot weather which encouraged fewer Northern Europeans to travel, it adds  And a £1.6 billion debt pile made it less able to react to change.  After the company went under, it emerged bosses raked in millions from the doomed travel giant  Chief executive Peter Fankhauser, 58, took more than £8.4milion out of the failed company, since 2015  Harriet Green, chief executive between 2012 and 2014 took home almost £11million in total pay and in 2015 alone, she received £6 3million, despite only working for two months of that financial year.  Chief financial officer Michael Healey, 69, took home a total of £8 3million between 2012 and 2018 in salary and bonuses.  We pay for your stories! Do you have a story for The Sun Online news team? Email us at [email protected] or call 0207 782 4368 . You can WhatsApp us on 07810 791 502. We pay for videos too Click here to upload yours.