The Court of Justice has upheld the General Court’s ruling dismissing American Airlines’ action for annulment against the Commission’s decision to grant Delta Air Lines grandfathering rights over slots at Heathrow Airport. American Airlines had offered to divest slots for the London-Philadelphia route at London Heathrow airport in 2013 to secure the Commission’s approval for its merger with US Airways. Clause 1.10 of the commitments stipulated that the purchaser would get grandfathering rights if it would make ‘appropriate use’ of the slots. The Court concluded that Delta’s use of the slots was indeed appropriate, and that American Airlines’ claim that it had been improperly excluded was unfounded. The ruling highlights the importance of clear and precise commitments in merger agreements.