The head of British Airways' parent company has blamed human error for the computer problems that caused chaos for tens of thousands of passengers over the bank holiday weekend. The chief executive of IAG, Willie Walsh, said an engineer had disconnected the power supply to a data centre, and then reconnected it without following the correct procedure. Dan and Neil teach you the language the world's media is using to discuss this story. Key words and phrases: human error = a mistake made by a person meltdown = the complete failure of a system fiasco = a complete and embarrassing failure For more, visit our website: http://www.bbc.co.uk/learningenglish/english/course/english-you-need/unit-18/session-2 [Image: Getty Images]