You could ask Aang. I bet he'd know. Although... Actually, now that I think about it, I think he said something about being from the past. [He rubs the back of his neck.] It's supposed to be a secret, but I guess if you're from the past too, it wouldn't be a secret from you.

[That logic works somehow. He's pretty sure of it.

His eyes follow Sokka's finger, first to the airships, then to the satomobiles. His eyes widen at the other teen's comment about the first.]

Whoa, you invented those? You must be some kind of genius!