Originally Posted by
Aspan
As I have stated before the "sticker" is not needed, at least on the west coast. Confirmed by SEA CBP twice now.
Perhaps not technically required, but I understand that at some airports, e.g. ORD, you might get harassed if you don't have the sticker.
I'll be on a non-precleared YQR-ORD flight in May, so I can report firsthand then.