Air travelers faced delays Saturday because of a worldwide computer systems failure at British Airways, the airline said. BA apologized in a statement for what it called an "IT systems outage" and said it was working to resolve the problem. It said in a tweet that the problem is global. Passengers at Heathrow Airport reported long lines at check-in counters and flight delays, AP reported. Heathrow said the IT problem had caused "some delays for passengers and it was working with BA to resolve it.