Factbox - What do we know about BA's computer meltdown?

A computer system failure at British Airways on Saturday forced the airline to ground hundreds of flights, leaving 75,000 passengers stranded as its flight operations, call centre and website all went down.The British flag carrier has said the problem was caused by a power supply issue at one of its UK data centres.Below is what we know so far about the IT failure:* BA described the problem as a "power supply issue at one of our UK data centres, which led to an exceptional power surge and caused