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The owner of British Airways is buying BMI from Lufthansa - giving it control of more than half of Heathrow's take-off slots.
The decision to make the acquisition by International Airlines Group (IAG) - which also owns Iberia - has angered rival Virgin Atlantic.
The sale will increase BA's hold on the take-off and landing slots at Heathrow airport, Britain's busiest. Assuming the deal goes through, IAG will end up in control of more than half of the slots.