Over the weekend, British Airways IT systems had a meltdown resulting in the cancellation of all services out of Heathrow and Gatwick airports. While this sort of issue would be a major issue on a quiet day, the fact it happened on a long weekend exacerbated the situation. Australian Business Traveller says it could cost the airline a pretty penny as passengers can make claims for compensation for sums ranging from €250 (A$375) through to €600 (A$900) per passenger under EU law.