occupied the majority of the terminal (gates C15–C44). American (the former US Airways flights) operated some flights from gates C35–C44 until December 9, 2017. The eastern concourse connected to Terminal C has been closed and demolished (Gates C15-C24), and the construction of the new Concourse E has been completed. The new concourse opened to the public on June 4, 2022. This new concourse is numbered 70–79 for its gates. Terminal D (1983—2022) Terminal D opened on June 19, 1983, at a cost of approximately $90 million, and was designed by William Nicholas Bodouva + Associates Architects to accommodate Delta's new Boeing 757 and Boeing 767 aircraft. This terminal also housed Northwest Airlines and Northwest Airlink from its opening in 1983 until the merger into Delta in 2009. As of January 8, 2020, Delta Air Lines and Delta Connection operate out of the new Concourse G that was connected to Terminal D. Terminal D was connected to Terminal C by a 600-foot walkway, which opened in early 2013 as part of Delta's effort to build a hub at LaGuardia. As of September 1, 2020, the walkway between Terminals C and D were demolished, and the construction of the new Concourse F is currently underway. As of June 4, 2022, Terminal D's check-in and baggage claim areas were closed. During the week of September 12–18, 2022, the central and eastern sections of Terminal D were demolished. The West end of Terminal D with a Delta Sky Club and gates 81–85 remain standing and are still in use. This section is connected to the new Terminal C via a walkway bridge. The remaining gates will stay in operation until the new Concourse F is complete which will use gate numbers 82–89. General aviation Although there is no separate terminal building for general aviation aircraft a pseudo-terminal is operated within the Marine Air Terminal (Terminal A), which is currently run by Sheltair Aviation providing full FBO services to private and charter aircraft owners-pilots including 100LL and Jet A fueling, computerized weather, and flight planning as well as pilot and passenger lounges. To access the General Aviation terminal an on-airport tenant must possess a SIDA (Security Identification Display Area) badge for unescorted access, transient aircraft owners-pilots and passengers must be escorted at all times into and out of the GA Terminal and to the ramp and hangar areas by the FBO staff. Following the events