Pooh Bear is, aerodynamically speaking, entirely unsuited for flight. Indeed, the only way he could fly is by breaking the law of gravity.
10 seconds sound clip from The New Adventures of Winnie the Pooh - Where Oh Where Has My Piglet Gone? / Up, Up and Awry (S2E7).
You can hear this line at 00:16:21.700 in the Blu-ray version of the TV Series.
Quote context
[...]
- Why, the whole idea is hippoposterous! Isn't it? Of course, it is... I think.
- I know! We'll ask Owl! He'll know if Pooh bears were meant to fly.
- You blow up a balloon, it floats. Same thing ought to work for bears.
- Just don't forget to flap, Pooh.
- You mean Pooh would be a criminal?
- Oh, dear, we have to stop him.
- Given the nature of updrafts and downdrafts, and cold drafts...
- Oh, my.
- Thank you for the use of your tail, Eyeore.
- Now, remember, Eyeore, you'll have to go very fast!
[...]