According to The Korea Herald, South Korea’s antitrust regulator approved Korean Air’s plan to merge its frequent-flyer program with Asiana Airlines’ on Tuesday, clearing the last major hurdle before the carriers become a single legal entity on Dec. 17. The decision sets the terms for how customers can use miles tied to about 4.07 trillion won ($3 billion) in combined accounting liabilities. As of the end of June, Korean Air had recognized 3.12 trillion won in deferred revenue linked to unused miles, while Asiana had recorded 946.