LONDON — Hundreds of passengers throughout Europe have been stranded by the abrupt collapse of the British regional airline Flybmi. British Midland Regional Limited, which operates as Flybmi, said it’s filing for administration - a British version of bankruptcy - because of higher fuel costs and uncertainty caused by Britain’s upcoming departure from the European Union. “Current trading and future prospects have also been seriously affected by the uncertainty created by the Brexit process, which has led to our inability to secure valuable flying contracts in Europe and a lack of confidence around bmi’sability to continue flying between destinations in...