International Airlines Group has confirmed subsidiary British Airways will purchase six daily slot pairs at London Heathrow from bmi British Midland International.
The slots will be used by British Airways from late October 2011 with the airline looking to expand both its long-haul and short-haul network at the airport.
British Airways is already the largest carrier at the property, with flights operating from the new Terminal 5 building.
The news comes as bmi owner Lufthansa confirmed it was looking to sell the carrier.
The German airline recently hired Morgan Stanley as adviser for a potential sale.
British Airways itself is seen as a potential suitor for bmi, with the British flag-carrier keen to acquire the 11 per cent of landing slots held by the airline at Heathrow.