I didn't see a forum where this exactly fit, so going with Technology.
On my most recent trip back to the US from Europe I had my Global Entry interview while passing through US customs. If you have applied for Global Entry and tried to schedule an interview in the US you know how challenging it can be to find a convenient interview slot.
Well, you can do an interview while coming through customes on the way home. Here is what I did. First, before my trip I completed my application and it was apporved by Customs. Second, Customs sent me an email with details regarding the interview upon entry process works and to encourge me to use it. Finally, as I came through Customs in Philadelphia I asked the Customs Agent for a Global Entry interveiw. The agent sent me to another agent who does the interviews. There was no line and no waiting for this agent. The interview and fingerprinting took about 5 minutes. Less than 12 hours later I received an email informing me that my Global Entry status was approved.
Next trip, no lines on entry. Go right to the Global Entry kiosk and scan my passport! Since you get 5 years of TSAPre as part of the the $100 fee, I think it will be $15 well spent.