Here's the info from
Purr-n-Fur UK: Cats in Wartime 1, On Land and in the Air
As well as his well-known black Labrador dog Nigger, Wing Commander Guy Gibson, of Bomber Command and also "Dambusters" fame, had a cat named Windy that apparently accompanied him on many of his hazardous wartime missions. He was described as 'an all-swimming, all-flying cat, who put in more flying hours than most cats'!