"A standard flight until …" wrote Roland Jantot, the chief pilot instructor at Club ULM 16-34 in Kourou, French Guiana, in the description of the YouTube video.
The video appears to be a routine flight of an ultra-light plane until about 45 seconds in, when the cat first appears from its hiding spot inside the wing.
It crawls out to the end of the frame of the wing, just above the passenger seat, and even then goes unnoticed for a few seconds until the pilot spots the stowaway.
"I still don't know if it got in after the pre-flight check or if I missed it," wrote Jantot.
The video ends with the plane landing, and Jantot leaving the pilot's seat and plucking the cat from its perch.
"The cat is doing well," wrote Jantot on YouTube. "She is still our mascot."