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I have been a pilot for 55 years and feel pretty stupid about these vintage planes.

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So can I safely say that the crashed plane is an Airco DH9 and the cockpit closeup is a DH-4 or DH4-B and the airplane in flight is an SE5?

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I believe that may well be an Airco DH9A "Ninak"

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The Airco DH-4 was a British two-seat biplane day-bomber of the First World War. It was designed by Geoffrey de Havilland (hence "DH") for Airco, and was the first British two seat light day-bomber to have an effective defensive armament. It first flew in August 1916 and entered service with the Royal Flying Corps (RFC) in March 1917. The majority of DH-4s were actually built as general purpose two-seaters in the USA, for service with the American forces in France.
The DH-9 was designed by de Havilland for the Aircraft Manufacturing Company in 1916 as a successor to the DH-4. It used the wings and tail unit of the DH-4 but had a new fuselage. This enabled the pilot to sit closer to the gunner/observer and away from the engine and fuel tank.The DH-9A - (also referred to as the Nine-Ack) was designed for Airco by Westland Aircraft to take advantage of the 400 hp (298 kW) American Liberty L-12 engine. Apart from the new engine and slightly larger wings it was identical to the DH-9. Initially it was hoped to quickly replace the DH-9 with the new version - however a shortage of Liberty engines available to the RAF curtailed the new type's service in the First World War – and it is best known as a standard type in the postwar RAF – serving as a general purpose aircraft for several years. 2,300 DH-9As were built by ten different British companies.

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The DH-4 was an ever-present element of the U.S. Army Air Service both during and following World War I. When the United States entered WWI in April 1917, the Aviation Section of the Signal Corps only had 132 aircraft, all obsolete. Modeled from a combat tested British De Havilland design, the DH-4 was the only U.S. built aircraft to see combat during WWI. With inadequate funding to buy new aircraft, the newly created U.S. Army Air Service continued to use the DH-4 in a number of roles during the lean years following the war. By the time it was finally retired from service in 1932, the DH-4 had been developed into over 60 variants.

During WWI, the Air Service used the DH-4 primarily for day bombing, observation and artillery spotting. The first American-built DH-4 arrived in France in May 1918, and the 135th Aero Squadron flew the first DH-4 combat mission in early August. By war's end, 1,213 DH-4s had been delivered to France.

Unfortunately, the early DH-4s had drawbacks, including the fuel system. The pressurized gas tank had a tendency to explode and a rubber fuel line under the exhaust manifold caused some fires. This led to the title "The Flaming Coffin," even though only eight of the 33 DH-4s lost in combat by the United States burned as they fell. Furthermore, the location of the gas tank between the pilot and observer limited communication and could crush the pilot in an accident.

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