Question: In aerodynamics, pitch-up is a severe form of stall in an aircraft, at transonic speeds the aerodynamic loads can become so high as to break up the aircraft, as occurred in 1964 when which type of supersonic fighter-bomber, used by the United States Air Force Thunderbirds broke up in mid-air?

Context paragraphs:
30th Bombardment Squadron: The 30th Bombardment Squadron is a United States Air Force unit.  On 19 September 1985 it was consolidated with the USAF Air Demonstration Squadron, also known as the United States Air Force Thunderbirds.

Pitch-up: In aerodynamics, pitch-up is a severe form of stall in an aircraft.  It is directly related to inherent properties of all swept wings, and seen primarily on those platforms.  Unlike conventional low-speed stalls, pitch-up can occur at any speed, and are especially dangerous when they take place in the transonic; at these speeds the aerodynamic loads can become so high as to break up the aircraft, as occurred in 1964 when a F-105 Thunderchief of the USAF Thunderbirds broke up in mid-air.

Propulsion Wind Tunnel Facility: The Propulsion Wind Tunnel Facility, located at Arnold Engineering Development Complex, Arnold Air Force Base, Tennessee, holds three wind tunnels: the 16-foot transonic (16T), 16-foot supersonic (16S), and the aerodynamic 4-foot transonic (4T) tunnels.  The facility is devoted to aerodynamic and propulsion integration testing of large-scale aircraft models.  The tunnels are powered by a large compressor plant which allows the wind tunnels to run for extended periods of time.  The test unit is owned by the United States Air Force and operated by Aerospace Testing Alliance.

Lloyd W. Newton: Lloyd W. "Fig" Newton (born December 24, 1942) is a retired United States Air Force four-star general who served as Commander, Air Education and Training Command (COMAETC) from 1997 to 2000.  He was also the first African-American pilot in the U.S. Air Force Thunderbirds.

Beechcraft T-6 Texan II: The Beechcraft T-6 Texan II is a single-engine turboprop aircraft built by the Raytheon Aircraft Company (which became Hawker Beechcraft and later Beechcraft Defense Company, and was bought by Textron Aviation in 2014).  A trainer aircraft based on the Pilatus PC-9, the T-6 has replaced the Air Force's Cessna T-37B Tweet and the Navy's T-34C Turbo Mentor.  The T-6A is used by the United States Air Force for basic pilot training and Combat Systems Officer (CSO) training and by the United States Navy and United States Marine Corps for primary Naval Aviator training as well as primary and intermediate Naval Flight Officer (NFO) training.  The T-6A is also used as a basic trainer by the Royal Canadian Air Force (CT-156 Harvard II), the Greek Air Force, the Israeli Air Force ("Efroni"), and the Iraqi Air Force.  The T-6B is the primary trainer for U.S. student naval aviators.  The T-6C is used for training by the Mexican Air Force, Royal Air Force, Royal Moroccan Air Force, and the Royal New Zealand Air Force.

Republic F-105 Thunderchief: The Republic F-105 Thunderchief was a supersonic fighter-bomber used by the United States Air Force.  The Mach 2 capable F-105 conducted the majority of strike bombing missions during the early years of the Vietnam War; it was the only U.S. aircraft to have been removed from combat due to high loss rates.  Originally designed as a single-seat, nuclear-attack aircraft, a two-seat Wild Weasel version was later developed for the specialized Suppression of Enemy Air Defenses (SEAD) role against surface-to-air missile sites.  The F-105 was commonly known as the "Thud" by its crews.

Boeing X-53 Active Aeroelastic Wing: The X-53 Active Aeroelastic Wing (AAW) development program is a completed American research project that was undertaken jointly by the Air Force Research Laboratory (AFRL), Boeing Phantom Works and NASA's Dryden Flight Research Center, where the technology was flight tested on a modified McDonnell Douglas F/A-18 Hornet.  Active Aeroelastic Wing Technology is a technology that integrates wing aerodynamics, controls, and structure to harness and control wing aeroelastic twist at high speeds and dynamic pressures.  By using multiple leading and trailing edge controls like "aerodynamic tabs", subtle amounts of aeroelastic twist can be controlled to provide large amounts of wing control power, while minimizing maneuver air loads at high wing strain conditions or aerodynamic drag at low wing strain conditions.  The flight program which first proved the use of AAW technology in full scale was the X-53 Active Aeroelastic Wing program.

Punta Gorda Airport (Florida): Punta Gorda Airport (IATA: PGD, ICAO: KPGD, FAA LID: PGD) is a public airport three miles southeast of Punta Gorda, in Charlotte County, Florida.  It is owned by the Charlotte County Airport Authority and was formerly called Charlotte County Airport.  The airport has mainly been used by single engine and small jet aircraft, but has recently seen more scheduled airline service, with numerous flights offered by Allegiant Air.  The airport is home to the Florida International Air Show, an annual event which has featured various military demonstration teams, such as the United States Navy's Flight Demonstration Squadron, the "Blue Angels"; the "U.S. Air Force Thunderbirds"; and the United States Army's "Sky Soldiers" (173rd Airborne Brigade Combat Team) Cobra helicopter team.

United States Air Force Thunderbirds: The USAF Air Demonstration Squadron ("Thunderbirds") is the air demonstration squadron of the United States Air Force (USAF).  The Thunderbirds are assigned to the 57th Wing, and are based at Nellis Air Force Base, Nevada.  Created in 1953, the USAF Thunderbirds are the third oldest formal flying aerobatic team (under the same name) in the world, after the United States Navy Blue Angels formed in 1946 and the prestigious French Air Force Patrouille de France formed in 1931.

Cape Cod Air Show &amp; Open House: The Cape Cod Airshow & Open House was an airshow held in August of every odd numbered year at Otis Air National Guard Base in Falmouth, Massachusetts.  It most recently was run in 2007 after a six-year hiatus.  The show in 2003 was canceled because of Operation Iraqi Freedom and the show in 2005 was canceled for unknown reasons.  The most recent show exhibited the 101st Air Refueling Wing, the 102nd Fighter Wing, the 103rd Fighter Wing, the 104th Fighter Wing, and various other aircraft from the United States and Canada.  The United States Air Force Thunderbirds performed as well.  The show was usually attended by several hundred thousand spectators.

Supporting paragraphs: Pitch-up Republic F-105 Thunderchief
Answer: Republic F-105 Thunderchief