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.
The aviation industry has a shortage of staff after thousands were laid off during the pandemic, which paralysed the sector for months.
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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".