Eleventh Air Force (11AF) of Pacific Air Forces (PACAF). The 673d and the base were subsequently reassigned from Eleventh Air Force to the 11th Air Control Wing (11 ACW). The Cobra Dane radar was integrated into the Joint-Service DOD Ballistic Missile Defense System (BMDS). The air station also serves as a diversion airport for civilian aircraft which encounter an emergency while travelling across the Pacific Ocean. On 6 April 1993 China Eastern Airlines Flight 583 was authorized to make an emergency landing on the airbase. The staff of the airbase provided humanitarian aid to the passengers and crews of the flight, and transferred the wounded to Anchorage. On 1 July 1994, the 11th Air Control Wing was inactivated and the 673 ABG was reassigned back to Eleventh Air Force. The 673d Air Base Group provided base support to various tenant units assigned to other Air Force commands, such as the Air Force Space Command and other agencies involved in intelligence gathering activities directed by the National Command Authority. On 24 December 2018, Delta Air Lines Flight 128 from Beijing to Seattle diverted to Eareckson Air Station after pilots were alerted to a "potential engine issue". The diverted plane, a Boeing 767-300ER, spent about 12 hours at Eareckson Air Station before being ferried back to Seattle. Delta sent a replacement B767-300ER from Seattle to pick up the passengers which landed at Eareckson Air Station at 11:00. Major commands to which assigned Eleventh Air Force, 23 May 1943 Alaskan Air Command, 18 December 1945 – 1 July 1954; 15 July 1958 Air (later Aerospace) Defense Command, 1 January 1967 Strategic Air Command, 1 December 1979 Air Force Space Command, 1 May 1983 Pacific Air Forces, 27 January 1992 – present Major units assigned United States Army Air Forces HQ IX Bomber Command, 3–31 March 1944 28th Bombardment Group, 26 February 1944 – 20 October 1945 11th Fighter Squadron, 11 August 1945 – 15 August 1946 (P-38 Lightning) 54th Fighter Squadron, 18 October-20 November 1943 (P-38 Lightning) 344th Fighter Squadron, 25 June 1943 – 15 August 1946 (P-38 Lightning) 21st Bombardment Squadron, 27 July-19 September 1943 (B-24 Liberator) 404th Bombardment Squadron, 28 February 1944 – 5 January 1947 (B-24 Liberator) 343d Fighter Group, 5 October 1945 – 15 August 1946 626th Aircraft Control and Warning Squadron, 1946 66th Fighter Squadron, 15 August 1946 – 30 May 1947 United States Air Force 5021st Air