Trusted Traveler
In addition to the travel authorizations needed to get into the U.K. and the European Union, becoming a "trusted traveler" in the U.S. can help speed up times in the security lines and going thgrough customs.
These programs only help you at U.S. airports but we've found them to be worth far more than their cost.
For going through the security lines, there is TSA Pre✓. Until recently, having TSA Pre✓ was a great advantage because you moved through a shorter line, did not have to remove liquids or belt or remove your shoes or computer. With these restrictions lessening in the past year or so, these advantages may be less. But we'll be renewing nonetheless.
For easing the pain of going through U.S. customs upon returning, there is Global Entry. Global entry includes TSA Pre✓ but costs a bit more. Upon arriving in the first U.S. or Canadian city upon return from Europe, folks with Global Entry can move through an automated line that uses passport and facial recognition checks to get you in and out quickly.
We have only one experience using Global Entry at customs, at J.F.K. Airport in New York City. But we sped through customs in just a minute or two compared to what was probably a 30+ minute wait for others. So far, renewing seems like a no-brainer. Granted, this only applies to international flights whereas TSA Pre✓ applies to all domestic flights as well as international outbound flights.
TSA Pre✓ currently runs about $77 while Global Entry is about $120. Each is good for five years.
It's important to note that getting TSA Pre&check can be done at more places, including Staples. Global Entry, on the other hand, requires a 15-minute interview and is generally only offered at or near aiports. Also, achedule your interview early as spots can fill up for months in advance. Walk-ins are accepted so it may be worth a phone call if you have some time and want to get your interview done early.
Once your application (and interview in the case of Gloabl Entry) are fulfilled, you'll be assigned a "known traveler number" or "KTN", a nine- or ten-digit number that you can specify when making flight reservations. This will place a TSA Pre✓ marker on your boarding pass and allow you to enter the TSA Pre✓ security line. The physical card you receive in the mail is not needed for flights, only for entering the U.S. via ferry.
See the DHS Trusted Traveler Program website for more information and instructions on applying for both TSA Pre✓ and Global Entry.