It's not, but probably because the flexie is from his engineering master Harper who was from a super-tech future world and had computers that were about the width of a sheet of paper.

BUT THAT'S OKAY.

Sokka beams and that expression certainly isn't going anywhere anytime soon. "Awesome," Sokka proclaims this - the jet, the guy making it, the general situation, the world at this exact moment in time. "Are you building it just because or for something in particular? Like tool-retrieval."