Aircraft condensation trails

(Section 2.1.3.6.3)

Aircraft condensation trails (contrails) that have persisted for at least 10 minutes will be given the name of the genus, Cirrus, followed only by the special cloud name “homogenitus”, so a contrail will be known only as Cirrus homogenitus. As new, or recently formed aircraft condensation trails may undergo a fairly rapid state of change and may display a variety of transient shapes, no species, varieties or supplementary features will be applied to the name.