Abstract: A lift spoiler for use on the wings of parked aircraft to reduce lift forces produces by the aircraft wings and that are produced during storms and high wind speed conditions. The lift spoiler includes a generally rectangular spoiler panel that is supported relative to the wing upper surface by a pair of holders. The holders include suction-cup-type attachments for securely attaching the lift spoiler relative to the wing upper surface to deflect airflow over the wing surface and thereby reduce the lift effect of the airflow that acts on the wing to otherwise lift the aircraft during high wind speed conditions and cause possible damage to the aircraft while it is parked.