Actually, I beg to differ - this is an aircraft registration. Tail numbers are more commonly associated with military aircraft, and the term is well-used, for example, in the USA military because the aircraft identification is a number and is almost always on the tail (fin) of the aircraft.
Tail number is synonymous with registration number.
On civilian aircraft tail number refers to the registration number.
On Military aircraft, tail number is the serial number.
Examples:
https://flightaware.com/resources/registration/ https://aviation-edge.com/aircraft-r...mber-database/
and please...dont beg.
The
empennage also known as the
tail or
tail assembly, is a structure at the rear of an aircraft that provides stability during flight, in a way similar to the feathers on an arrow.