Originally Posted by Forbes.com

These Airports Let You Make Reservations For The Security Lines
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The reservation system is akin to theme park fast passes, except making a security screening appointment is completely free to travelers and doesn't require any kind of membership programs.
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Clear powers the Reserve system, which is now available at 19 airports across North America and Europe.
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How far in advance you can reserve your security screening spot varies by airport. But at DEN, for instance, users can book their spots three days ahead of their flights.

The reservation system prompts you to enter information about where they’re flying, how many people are in your group, which airline you’re flying as well as your departure date and time. From there, you’ll get a QR code to show airport staff when you show up for your appointment.