Thousands of passengers are facing disruption after flights were cancelled, delayed or diverted on Thursday evening.
National Air Traffic Services said: "Air traffic control restrictions have been put in place this afternoon due to a short notice staff absence affecting our air traffic control team at Gatwick Airport. "New air traffic controllers have been recruited since last summer, increasing our presence by 17%, and others are due to start after completing their training, in line with the agreed plan when Nats took over the contract last October.
"London Gatwick would like to apologise to any passengers who have been impacted by these restrictions. Please contact your airline for more information.
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