British Airways (BA) has promised “an exhaustive investigation” into what caused the collapse of its IT systems over the weekend, causing widespread cancellations and chaos. BA, which is owned by IAG and is a oneworld alliance member, said it anticipated operating a close-to-normal schedule May 29, but was continuing to experience lingering aftereffects of its catastrophic May 27 IT crash. An airline spokeswoman said the airline had operated “virtually all” of its ...

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