There was a grownup twist: write your phone number on the plane and see if anyone takes the plane with them when they leave the train - and then wonder if anyone will call. I gave them a pen so they could write on the next batch. As I've said, I'm not one to make the first move and talk to people. But being asked for a pen gave me the opportunity to comment on the planes and ask about the phone number thing. Another man on the train had already started talking to them and learning folding techniques to take home to his kids.
I don't think I've even seen paper planes in years, let alone made them. Sigh. Perhaps it's time to see if our kids are old enough to throw paper planes.