Question: What company provided the ejection seat system for the fighter aircraft that had wings built by Boeing for the United States Air Force's Advanced Tactical Fighter program?

Context articles: Northrop YF-23
General Electric YF120
419 Tactical Fighter Training Squadron
ACES II
Lockheed Martin F-22 Raptor
Lockheed YF-22
496th Tactical Fighter Squadron
Boeing 818
Advanced Tactical Fighter
McDonnell Douglas F-15 Eagle

The Northrop/McDonnell Douglas YF-23 was an American single-seat, twin-engine stealth fighter aircraft technology demonstrator designed for the United States Air Force (USAF).
 The design was a finalist in the USAF's Advanced Tactical Fighter (ATF) competition, battling the Lockheed YF-22 for a production contract.
 Two YF-23 prototypes were built, nicknamed "Black Widow II" and "Gray Ghost".
The General Electric YF120 was a variable cycle turbofan engine designed by GE Aircraft Engines in the late 1980s/early 1990s for the United States Air Force's Advanced Tactical Fighter (ATF) project (which resulted in the F-22 Raptor).
 GE lost the engine competition for this aircraft to Pratt & Whitney F119.
419 Tactical Fighter Training Squadron (French: "419 Escadron d'entraînement à l'appui tactique" ) is a unit of the Royal Canadian Air Force.
 The squadron was originally formed during the Second World War and is currently based at CFB Cold Lake.
 It is responsible for advanced tactical fighter training for pilots of the RCAF and as part of the NATO Flying Training in Canada (NFTC) program using nine CT-155 Hawk trainers.
ACES II is an ejection seat system manufactured by the United Technologies Aerospace Systems (UTAS) division of the United Technologies Corporation (UTC).
 ACES is an acronym for Advanced Concept Ejection Seat.
 It is used in Fairchild Republic A-10 Thunderbolt II, McDonnell Douglas F-15 Eagle, General Dynamics F-16 Fighting Falcon, Lockheed Martin F-22 Raptor, Lockheed F-117 Nighthawk, Rockwell B-1 Lancer, WB-57, and Northrop Grumman B-2 Spirit aircraft.
 Over 10,000 ACES II seats have been produced with over 5,000 actively flying throughout the world as of 2013.
 It is known throughout the industry as the lowest life cycle cost third generation seat due to the USAF owning the rights to the seat, facilitating competitive replacement part procurement.
 In addition, the buying power of 5,000 in-service seats and previous service life extension programs have further driven down support costs.
The Lockheed Martin F-22 Raptor is a fifth-generation, single-seat, twin-engine, all-weather stealth tactical fighter aircraft developed for the United States Air Force (USAF).
 The result of the USAF's Advanced Tactical Fighter program, the aircraft was designed primarily as an air superiority fighter, but also has ground attack, electronic warfare, and signal intelligence capabilities.
 The prime contractor, Lockheed Martin, built most of the F-22's airframe and weapons systems and conducted final assembly, while Boeing provided the wings, aft fuselage, avionics integration, and training systems.
The Lockheed/Boeing/General Dynamics YF-22 was an American single-seat, twin-engine fighter aircraft technology demonstrator designed for the United States Air Force (USAF).
 The design was a finalist in the USAF's Advanced Tactical Fighter competition, and two prototypes were built for the demonstration/validation phase of the competition.
 The YF-22 won the contest against the Northrop YF-23, and entered production as the Lockheed Martin F-22 Raptor.
 The YF-22 has similar aerodynamic layout and configuration as the F-22, but with differences in the position and design of the cockpit, tail fins and wings, and in internal structural layout.
The 496th Tactical Fighter Squadron is an inactive United States Air Force unit, last assigned to the United States Air Forces in Europe, 50th Tactical Fighter Wing, being stationed at Hahn Air Base, Germany.
 The squadron was inactivated on 15 May 1991.
Boeing 818 was the Boeing's candidate for the U.S. military's TFX fighter completion.
 The U.S. Air Force and Navy were both seeking new aircraft when Robert McNamara was appointed U.S. Secretary of Defense in January 1961.
 The aircraft sought by the two armed services shared the need to carry heavy armament and fuel loads, feature high supersonic speed, twin engines and two seats, and probably use variable geometry wings.
 On 14 February 1961, McNamara formally directed the services to study the development of a single aircraft that would satisfy both requirements.
 Early studies indicated that the best option was to base the design on the Air Force requirement, and use a modified version for the Navy.
 In June 1961, Secretary McNamara ordered the go ahead of Tactical Fighter Experimental (TFX) despite Air Force and Navy efforts to keep their programs separate.
The Advanced Tactical Fighter (ATF) was a demonstration and validation program undertaken by the United States Air Force to develop a next-generation air superiority fighter to counter emerging worldwide threats, including Soviet Sukhoi Su-27 and Mikoyan MiG-29 fighters under development in the 1980s.
 Lockheed and Northrop were selected in 1986 to develop the YF-22 and the YF-23 technology demonstrator aircraft.
 These aircraft were evaluated in 1991 and the Lockheed YF-22 was selected and later developed into the F-22 Raptor.
The McDonnell Douglas F-15 Eagle is an American twin-engine, all-weather tactical fighter aircraft designed by McDonnell Douglas (now Boeing) to gain and maintain air supremacy in aerial combat.
 Following reviews of proposals, the United States Air Force selected McDonnell Douglas' design in 1967 to meet the service's need for a dedicated air superiority fighter.
 The Eagle first flew in July 1972, and entered service in 1976.
 It is among the most successful modern fighters, with over 100 victories and no losses in aerial combat, with the majority of the kills scored by the Israeli Air Force.