London was hit Monday by a subway strike on top of train and flight delays and cancellations that caused travel chaos in Britain following four-day Platinum Jubilee weekend.
It is now struggling to recruit workers while demand is rebounding and summer travel approaches. The sector blames the authorities for not accelerating the vetting process for new airport and airline recruits.
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Airlines for Europe, which represents EU airlines, predicted the problem would continue "for a good chunk of the summer season".