IAG has reached an agreement in principle with Lufthansa for the sale of bmi with a deal likely to be completed in the first quarter of 2012, subject to due diligence and regulatory clearances.
With 9% of the take-off and landing slots at Heathrow, bmi is currently the second-largest carrier at the gateway, behind BA with 43.1% of slots.
Buying bmi offers IAG the opportunity to grow at Heathrow, which is currently operating at full capacity after plans to build a third runway were scrapped.
The acquisition would mean that IAG would have more than half of the landing slots at the UK's busiest airport.
Virgin Atlantic, which has also made a bid for bmi and has just 3.1% of slots at Heathrow, is likely to strongly oppose the deal on competition grounds.
















