Does "walking out with the sticker" equate to "being able to use the machine"? Seems like walking up to a machine that doesn't know who I am won't help me. ;-) Or is the sticker enough to at the very least get me to the front of the line even if the machine doesn't know who I am?

Also, I'm planning on scheduling the interview during a 4hr layover at EWR next week... does anyone know what happens if you miss a scheduled interview? While I certainly plan on padding the arrival->interview schedule by a good bit, it's always possible that my inbound is cancelled or very heavily delayed... and I don't want to risk getting red-flagged.