Question: Who produced the aircraft that Attack Squadron 134 flew?

Context paragraphs:
VA-44 (U.S. Navy): Attack Squadron 44 (VA-44) was an attack squadron of the United States Navy.  Originally established as Bombing Squadron VB-75 on 1 June 1945 it was redesignated Attack Squadron VA-3B on 15 November 1946, redesignated VA-44 on 1 September 1948 and disestablished on 8 June 1950.  A second VA-44 was in service from 1 September 1950 until disestablishment on 1 May 1970.

Second VA-75 (U.S. Navy): Attack Squadron 75 (VA-75) or ATKRON 75 was an attack squadron of the United States Navy that was active from World War II through the 1990s.  Nicknamed the "Sunday Punchers," they were based out of Naval Air Station Oceana, Virginia.  Originally established as Bombing Squadron EIGHTEEN (VB-18) on July 20, 1943, it was redesignated Attack Squadron VA-7A on 15 November 1946, redesignated Attack Squadron VA-74 on 27 July 1948, redesignated Attack Squadron VA-75 on 15 February 1950 and disestablished on February 28, 1997.  They were the second squadron to be designated VA-75, the first VA-75 was disestablished on 30 November 1949.  They were the first fleet squadron to operate the A-6 Intruder and the last unit to fly it in operational service.

VAQ-134: Electronic Attack Squadron 134 (VAQ-134), also known as the "Garudas", is a United States Navy EA-6B Prowler squadron based at Naval Air Station Whidbey Island.

Second VA-155 (U.S. Navy): Attack Squadron 155 or VA-155 was an 'Attack Squadron of the U.S. Navy.  It was established as Reserve Attack Squadron VA-71E in 1946, redesignated as VA-58A on 1 October 1948, and redesignated Reserve Composite Squadron VC-722 on 1 November 1949.  The squadron was redesignated as VA-728 on 1 April 1950, and called to active duty on 1 February 1951.  It was ultimately redesignated VA-155 on 4 February 1953, and disestablished on 30 September 1977.  Its nickname was Silver Fox from the early 1960s onward.  It was the second squadron to be named VA-155, the first VA-155 was disestablished on 30 November 1949, while a third VA-155 was established on 1 September 1987 and disestablished on 30 April 1993.

Douglas A-4 Skyhawk: The Douglas A-4 Skyhawk is a single seat subsonic carrier-capable attack aircraft developed for the United States Navy and United States Marine Corps in the early 1950s.  The delta winged, single turbojet engined Skyhawk was designed and produced by Douglas Aircraft Company, and later by McDonnell Douglas.  It was originally designated A4D under the U.S. Navy's pre-1962 designation system.

VMFA-134: Marine Fighter Attack Squadron 134 (VMFA-134) was a reserve F/A-18 Hornet squadron in the United States Marine Corps.  Known as "Smoke", the squadron was based at Marine Corps Air Station Miramar, California and fell under Marine Aircraft Group 46 (MAG-46) and the 4th Marine Aircraft Wing (4th MAW).  On April 1, 2007 the squadron was transitioned to cadre status and its gear and personnel were redistributed throughout the remaining F/A-18 Hornet squadrons.

Second VA-134 (U.S. Navy): Attack Squadron 134 or VA-134 was a short-lived attack squadron of the U.S. Navy, nicknamed the "Scorpions".  It was established on 21 August 1961 and disestablished a year later, on 1 October 1962.  It was based at NAS Cecil Field and flew A4D-2 "Skyhawk" aircraft.  It was the second squadron to be designated as VA-134, the first VA-134 was redesignated VF-174 on 15 February 1950.

Second VA-135 (U.S. Navy): Attack Squadron 135 or VA-135 was a short-lived Attack Squadron of the U.S. Navy, nicknamed the "Thunderbirds".  It was established on 21 August 1961 and disestablished a year later, on 1 October 1962.  It was based at NAS Jacksonville, and for a short time in 1962 at NAS Cecil Field.  The squadron flew the AD-6 "Skyraider" aircraft.  It was the second squadron to be designated as VA-135, the first VA-135 was disestablished on 30 September 1949.

VPB-134: VPB-134 was a Patrol Bombing Squadron of the U.S. Navy.  The squadron was established as Bombing Squadron 134 (VB-134) on 29 March 1943, redesignated Patrol Bombing Squadron 134 (VPB-134) on 1 October 1944 and disestablished on 25 April 1945.

Second VA-36 (U.S. Navy): Attack Squadron 36 (VA-36), nicknamed the "Roadrunners", was an Attack Squadron of the U.S. Navy.  The squadron was established on 6 March 1987 at NAS Oceana, Virginia, where it was based during its entire life.  It flew the A-6E "Intruder" until it was disestablished on 1 April 1994.  It was the second squadron to be designated VA-36, the first VA-36 was disestablished on 1 August 1970.

Supporting paragraphs: Second VA-134 (U.S. Navy) Douglas A-4 Skyhawk
Answer: Douglas Aircraft Company