The pilot in this video needs to add another item to his checklist.
I love the way his eyes bug out when he sees the stowaway. 
Whoops.
In aviation terms, I think that’s what they call a stray cat strut.
That’s hilarious! I didn’t expect it to turn up where it did.
That cat knows how to play it cool.
Cutest stowaway ever 
It thought it was a chat room.
*♫ I don’t bother chasing mice around.
I sneak into the plane, hiding in the wing
Feel the wind in my face as I ride that thing… ♫ *
EDIT: ‘Stray cat strut’ FTW, BTW. 
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I didn’t have audio but it seems the pilot saw it and was trying to communicate to his passenger for quite awhile before she actually looked up to see the cat.
The audio is from the camera’s microphone, so all you hear is the buzzing of the airplane. You can hear some speech at the end, after they land and the engine is shut down, but it’s reasonably quiet and in French.
(Mrowr) What did you jerks do with my carry-on bag?
Preflight failure! 
Exactly! The shadow of the cat was clearly visible through the wing fabric. I have no idea how you miss that with even a cursory look.
I’m guessing the the fabric on the lower part of the wing will need to be checked for holes: a cat in full fear mode has everything hard and sharp at its disposal fully extended and engaged.
Look at the camera aim point.
Watch the pilot & passengers expressions & mannerisms leading up to kitty entrance.
A total set up.
Cute & fun, but a set up.
Sure. Like anyone is going to purposely scare the shit out of a cat and risk the cat plummeting a thousand feet to its death for a Youtube video.
It’s aimed at the paying passenger. And given that this was a joyflight for said passenger, your point would be…?
. . . that the passenger was a cat disguised as a human. A total set up.
That’s a lucky feline. It could have ended in a catastrophe.
(sorry)
Pre-flight check-lists now include “Kitty on wing”.
I am glad it had a happy ending.