Aircraft are usually organised into squadrons, which are structured similarly to Space Marine squads, except with [[Techmarine]]s piloting (usually 3) aircraft instead of infantry. Squadrons are led by a wing leader, who combines the function of a [[Space Marine Sergeant|Sergeant]] and a Techmarine. Squadrons are also often attached to Companies, and bear that company's insignia. While there is no official marking scheme for squadrons, aircraft are usually marked with large blocks of colour on the wings and tail for easy identification from long distances, with the wing leader's aircraft featuring the most ornate design. Numbers applied to aircraft's hulls can also be used to differentiate between aircraft in the same squadron, with the wing leader usually being numbered 1.{{Fn|40}}

===Ranks===