Has a civil aviation accident ever involved more than two manned aircraft? Has a civil aviation accident ever involved more than two manned aircraft? Meaning, in one accident: more than two manned aircraft had fatalities or serious injuries or significant damage; or one or two manned aircraft had fatalities or serious injuries or significant damage, while other manned aircraft contributed to the accident, totaling three or more aircraft.
If military aircraft were involved, that would also be of interest, as long as at least one aircraft was civil aviation.
The Rammstein Airshow Disaster comes to mind, where one airplane of the Italian Air Force display team collided with 2 others during a display, so 3 airplanes were involved in the collision in the air. A medivac helicopter on the ground was also destroyed, which was manned at the time, fatally injuring the pilot.