Plain English Meaning

Wind coming from behind the aircraft, helping it move faster across the ground.

Full Definition

A wind blowing in the same direction as the aircraft's flight path, pushing it forward and increasing groundspeed relative to airspeed.

Context Anchor

You will see tailwind used in weather reports, runway selection, takeoff and landing planning, and flight time calculations.

Derivation

From 'tail' (the rear of the aircraft) plus 'wind.' The name describes where the wind is coming from -- behind the tail -- which is why it pushes the aircraft along.

Why Pilots Care

Tailwinds increase groundspeed but decrease airspeed over , requiring longer and reducing .