Taken in 1919, this picture is a group portrait of Sir Victor Goddard's RAF squadron who had served in World War I aboard the HMS Daedalus. At the back of the airman, on the top row, fourth from the left, can be seen the face of a ghost.
It is said to be the face of Freddy Jackson, an air mechanic who had been accidentally killed by an airplane propeller two days earlier. His funeral had taken place on the day this photograph was taken, and members of the squadron easily recognized the face as Jackson's.
It has been suggested that Jackson, unaware of his death, decided to show up for the group photo.