Concourse D has 13 gates and serves as the international concourse. The lower bowl concourse, called the Madison Concourse, remains on the 6th floor. The MTA also started installing escalators between the lower concourse and the platform mezzanine. The below ground concourse and subway entrances are Grade II listed. The public rooms had balconies overlooking the main station concourse. There are also five parking bays at the Northwest Concourse. Yankee Stadium is a baseball park located in Concourse, Bronx, New York City. Those passengers then exit directly back into the center of the A concourse. The original concourse with Gates A1-A11 opened in 1986. An exhibit was established at Pittsburgh International Airport in Concourse A. Gates C15-C24 are currently closed due to construction of a new concourse. Eleven gates at Terminal B's new Eastern Concourse opened on December 1, 2018. It was located at where the west concourse of Terminal 3 stands nowadays. Its platforms are under the concourse and railway platforms. It transports passengers between each end of Concourse A in just over three minutes.