April 7 in aviation: the first flight of the Boeing X-37 aircraft, the first flight of Aérospatiale Gazelle.

On April 7, 1922, the United States' Corps Observation Group conducted its first patrol, becoming the first American air unit to take action in Europe.

Other aviation events on April 7.

The first flight of Aerospatiale Gazelle.

On April 7, 1967, the first flight of Aérospatiale Gazelle took place. Aérospatiale Gazelle (company names SA 340, SA 341 and SA 342) is a French five-seater helicopter, commonly used for light transport, exploration and light attack tasks. It is powered by a single Turbomeca Astazou turbine engine and was the first helicopter to feature a window tail instead of a conventional rotor. It was designed by Sud Aviation, later Aérospatiale, and manufactured in France and the United Kingdom through a joint production agreement with Westland Aircraft. Subsequent production under license was carried out by SOKO in Yugoslavia and the British Arab Helicopter Company (ABHCO) in Egypt.

Since its introduction in operational service in 1973, Gazelle has been purchased and operated by a number of exporting customers. He also participated in numerous conflicts around the world, including Syria, during the 1982 war in Lebanon, in Rwanda during the Rwandan civil war in the 1990s, and by numerous participants on both sides of the 1991 Gulf War. In the French service, Gazelle was completed as a larger Eurocopter Tiger attack helicopter, but remains in use primarily as an exploration helicopter.

US planes have resumed regular bombing of North Vietnam.

On April 7, 1972, American aircraft resumed regular bombing of North Vietnam in response to the North Vietnamese invasion called the "Easter Offensive" in South Vietnam.

The STS-6 was launched using the Space Shuttle Challenger.

On April 7, 1983, the STS-6 was launched using the Space Shuttle Challenger.

Azerbaijan Airlines was established.

On April 7, 1992, Azerbaijan Airlines was established. Azerbaijan Airlines, also known as AZAL, is the flag carrier and the largest airline in Azerbaijan. Based in Baku, adjacent to Heydar Aliyev International Airport, the carrier operates to destinations in Asia, the CIS, Europe and the United States. Azerbaijan Airlines is a member of the International Air Transport Association (IATA). The airline was founded on April 7, 1992, after the country gained its independence.

Flight 705 operated by Federal Express experienced an attempted hijacking.

On April 7, 1994, Federal Express Flight 705, a McDonnell Douglas DC-10-30 aircraft, attempted a hijacking attempt by a FedEx employee. The three crew members were seriously injured, but managed to subdue the attacker and land the aircraft safely without loss of life.

A TAAG Angola L-100 (C-130) D2-THC aircraft caught fire while on the ground.

On April 7, 1994, a TAAG Angola L-100 (C-130) D2-THC aircraft caught fire on its way to the parking lot at Malengue Airport in Angola. All 4 occupants escaped unharmed. The cause of the accident was overheated brakes.

The first flight of the Boeing X-37 aircraft.

On April 7, 2006, the first flight of the Boeing X-37 took place. The Boeing X-37, also known as the Orbital Test Vehicle (OTV), is a reusable robotic spacecraft. It is stimulated into space by a launch vehicle, then re-enters the Earth's atmosphere and lands as a space plane.

The X-37 is operated by the United States Space Force, previously operated by the Air Force Space Command (until 2019) for orbital space flight missions designed to demonstrate reusable space technologies. It is a 120% scale derivative of the previous Boeing X-40. The X-37 began as a NASA project in 1999, before being transferred to the United States Department of Defense (DOD) in 2004.

Possible terrorist attack. United Airlines Flight 663.

On April 7, 2010, United Airlines Flight 663 turned into a "minor international incident". A Qatari diplomat traveling with United Airlines from Ronald Reagan Washington National Airport (Washington, DC) to Denver International Airport (Denver, Colorado), issued a terrorist alert in the air after smoking in the plane's toilet. The Qatari government recalled him to the country two days later.