Most nonrev’s have a passport. But many do not have Global Entry or another trusted traveler program that will help speed them thru customs when they get back to the USA.
There are a lot of options out there, each offering something a bit different from the others.
So which one to join? No need to sign up for all. You just need to find the right one for you.
The Washington Post just did a story on these options and outlining which one offers what and which might be the best for you.