On 4 November 2011, IAG agreed in principle to acquire British Midland International (BMI) from Lufthansa, in a deal which would increase IAG's share of slots at Heathrow airport from 45% to 54%.[21][22] On 22 December 2011, IAG agreed a binding deal with Lufthansa to acquire BMI for £172.5 million.[23] On 30 March 2012, the purchase was approved, subject to the condition that the combined group divest itself of 12 daily slots and lease two daily slots at Heathrow airport. The acquisition was completed on 20 April 2012, and the BMI fleet and routes were integrated into the British Airways schedule throughout 2012.[24] Slaughter and May advised IAG on the BMI acquisition.[25]