In route, what is the vertical spacing for number 2?

In a formation flying context, maintaining proper vertical spacing between aircraft is crucial for safety, coordination, and overall formation integrity. The correct answer reflects the standard practice of formation flying where the number 2 aircraft is typically positioned level with the lead aircraft. This position allows for optimal visibility and the ability to maintain a clear reference point for the number 2 pilot while ensuring sufficient separation to avoid wake turbulence and possible collisions.

When number 2 flies level with lead, the pilot can easily monitor the lead aircraft's flight path and intentions, making it easier to maintain suitable formation spacing. Being level also allows number 2 to be in a position to provide mutual support and to respond quickly to any changes in the lead’s altitude, bank angle, or flight direction.

The other options suggest positions that are either too low or too high relative to the lead, which could compromise the formation's stability and safety. A position above or higher than lead could lead to challenges in maintaining formation integrity, while being below lead may increase the risk of wake turbulence and limit the ability to effectively manage spacing and visibility.