Aircraft fairing

An aircraft fairing is a structure whose primary function is to produce a smooth outline and reduce drag.

[1] These structures are covers for gaps and spaces between parts of an aircraft to reduce form drag and interference drag, and to improve appearance.

[1][2] On aircraft, fairings are commonly found on:

The wing root fairing of an American Aviation AA-1 Yankee
A cockpit fairing or "pod" with a windshield on a P&M GT450 ultralight trike
Spats on a Cessna Skylane 182T
An aircraft wheel fairing, commonly called a wheel pant or spat or, by some manufacturers, a speed fairing
The flap track fairings on a Boeing 747