The Civil Aviation Authority (CAA) are set to investigate a stunt by Blackpool fans that saw them mock rivals Preston with an aerial display at the weekend.
A plane dragged two messages across the sky over Preston's home ground, Deepdale, as they played out their final game of the season against Watford (a 3-1 win), which read: "Poor little Preston enjoy League One" and "We are superior love Blackpool FC".
But, after the match, Preston manager Phil Brown registered his disgust at the prank, claiming: "If I had a gun I would have shot the plane down" and the CAA are now looking into the matter.
"Rules about flying aircraft over built-up areas are very clear, and we are investigating whether any infringements were committed. An aircraft cannot fly over a built up area below 1,000ft. We are currently looking at the pictures to make an assessment,'' a spokesman for the CAA told the Lancashire Evening Post.
"Our legal enforcement team will look into it, and if an infringement is believed to have been made, the issue will be taken up through the courts and the pilot behind it could be prosecuted."