A member of an Auckland flight training facility has left a message in the sky during a flight.

On Flightradar24, the aircraft's flight path can be seen spelling out the message 'I love you'.

A spokesperson for North Shore Aero Club confirmed one of their members, who did a lot of night flying, piloted the Alpha R2160 plane.

The plane was flown over Auckland city and Warkworth on Monday night.

Its pilot told RNZ they wished to remain anonymous.

"Not having flown at night in a while, I wanted to practise manoeuvres at night whilst writing a message that would make anyone smile."

North Shore Aero Club said the pilot was not on its staff ,and worked for Island Aviation.

Island Aviation has been approached for comment.