The airport, which is the second-busiest in the UK, was badly affected by air traffic control (ATC) staff shortages across Europe last year, and repeatedly suffered the same problem in its own control tower.
Naomi Leach, deputy editor of consumer magazine Which? Travel, said: It's clear from these latest figures that millions of passengers continued to experience unacceptably long hold-ups last year. This cannot be allowed to become the new normal.
CAA director Tim Johnson said it is vital the aviation sector focuses on resilience ahead of the summer holiday period to keep passenger d.
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