TSA PreCheck Touchless ID can save travelers time at dozens of participating airports. Here's how to sign up and which airports are included. (AP Photo)

TSA PreCheck offers faster screening at airports nationwide, including Phoenix Sky Harbor Airport. How it works and how to enroll.

Here's a video and diagram I made that explains the difference between all three program in the most simple way possible; while using cats, so anyone can understand the difference. Also I will explain using a walk through each procedure at the airport with each security service program and explaining why you would want to sign up for that program.

TSA PreCheck Touchless ID takes seconds to set up and can save you from long lines. But you need to enroll before you get to the airport.