Definition
More than one aircraft which, by prior arrangement between the pilots, operate as a single aircraft with regard to navigation and position reporting. Separation between aircraft within the formation is the responsibility of the flight leader and the pilots of the other aircraft in the flight. This includes transition periods when aircraft within the formation are maneuvering to attain separation from each other to effect individual control and during join-up and breakaway.
Plain English
Two or more aircraft flying together as one group by prior agreement. ATC treats them as a single aircraft. The flight leader and the other pilots are responsible for keeping themselves safely apart from each other — not ATC.
Context Anchor
Used when pilots plan to fly together as a coordinated group and when air traffic control needs to know that the group should be handled as one flight.
Derivation
“Formation” comes from the idea of forming or arranging something into a shape or organized group. That helps here because the aircraft are not random traffic; they are deliberately arranged and coordinated as one flight.
Why Pilots Care
Close-proximity flying demands strict procedures, radio discipline, and often ATC coordination to prevent mid-air collision; improper formation flight is a common cause of incidents.
Intuition Check
Formation flight does not mean any aircraft flying close together. It means the pilots agreed in advance to fly as one coordinated group.
Example Sentence 1
The two aircraft departed in formation flight, with the lead pilot handling all radio calls to ATC.
Example Sentence 2
During the ferry flight the two Cessnas maintained loose formation so they could share navigation duties and watch for traffic.