What formation requires number 2 to maintain level altitude with lead?

In formation flying, the Route formation requires the number 2 aircraft to maintain level altitude with the lead aircraft. This formation is characterized by the number 2 being positioned slightly behind and to the side of the lead, allowing for adequate separation while ensuring that both aircraft are flying at the same altitude.

In this configuration, maintaining level altitude is crucial for enhanced situational awareness and mutual visibility, which are key during various phases of flight. The number 2's ability to match the lead's altitude helps in managing risks associated with potential wake turbulence and enhances the overall integrity of the formation.

When considering the other formations: Echelon typically requires a slight altitude separation with number 2 positioned at an angle, while in a Turning Rejoin, number 2 may need to adjust altitude during the turn to rejoin safely. The Trail formation emphasizes a following position, which may involve varying altitudes as number 2 seamlessly integrates into the flow of flight. Each of these formations has unique characteristics, but it is the Route formation that emphasizes the need for number 2 to maintain level altitude.