I'm not sure because we have always used Mobile Passport in ATL. There is usually NO line when we get there. The Mobile Passport desk is at the far end of the immigration hall. I fill in all my info on the app while on the plane & then send it once we hit the terminal. As someone said, the walk is a long one so it's very easy to get it sent. And I THINK Don & I each fill out the app info on our phones. We have different last names which tends to confuse things - but in all honesty I'm not positive that's what we do