UK air traffic failure: Level of disruption 'unacceptable' - Airline group boss
Willie Walsh added: "It's a shocking performance from NATS, it has led to massive disruption and clearly it's unacceptable that we get this level of disruption at a peak time of the year."
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The IATA boss blasted National Air Traffic Services for causing chaos at Britain's airports and demanded the company foots the bill for the disruption.