Willie Walsh, chief executive of International Airlines Group (IAG), parent of British Airways, has stated that the computer system outage last week was caused by human error. An engineer had inadvertently switched off the power supply to one of the company data centres and it was then turned back on again in an uncontrolled fashion. “It’s very clear to me that you can make a mistake in disconnecting the power,” said Walsh at the IATA conference in Mexico. “It’s difficult for me to understand how to make a mistake in reconnecting the power.” Walsh added that if the power was

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