On 28 March 2011, a separate airfield that will serve as Sheremetyevo's third runway was approved. On 13 December 2011, the Federal Agency for State Property Management approved an agreement that merged the airport operators OAO Terminal (operator of Terminal D) and OJSC Sheremetyevo, consolidating control of the airport under one entity. On 26 December 2011, a new area control centre (ACC) was opened for Sheremetyevo, consolidating operations of the airport's different control centres to increase efficiency. The situational centre was also created as part of the ACC for joint work of top-managers, heads of state bodies, and partners of Sheremetyevo to resolve emergencies.