NEW: We compared TSA PreCheck vs. Clear, another membership that can speed up air travel. Here's what we found:

PreCheck:

*88% of travelers move through PreCheck in less than 5 minutes. (Clear didn't provide a number for comparison.)

*$78 every 5 years

*Requires application, in-person interview, background check and fingerprints.

*Part of the Department of Homeland Security.

Clear:

*$189 per year.

*Requires online sign-up, as well as an iris and thumbprint scan.

*Private company