(Bloomberg) -- London’s Heathrow airport said it would ask airlines to stop selling tickets for summer travel as the hub imposes a cap on daily passenger numbers to try to avert chaos due to staffing issues.

The UK’s biggest airport will limit daily passenger traffic to 100,000 people through Sept. 11, according to a statement Tuesday. The airport said that new recruits were not yet “up to full speed” and functions including ground handlers for baggage were “significantly under resourced.”

The airport said the latest travel forecasts show that the airport would have to handle as many as 104,000 passengers a day over the summer.

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