I thought I would share this, hope some of you finds it useful.
If you run into a situation where interview at arrival doesn't work because the location is too busy. There's a valuable tool/website you can use called ttptracker.com which not many people are aware of. Me and my wife needed an interview in preparation for our mini vacation and that's what I used. The site turned out to be a great way to snag a global entry appointment and works for nexus and sentri too. If you don’t mind staying glued to your computer, it’s totally free. But if you wanna get quicker updates through your phone, you can sign up for their SMS option which is still cheaper than these other sites that exist out there. I believe the site supports every single enrollment centers/locations and even automatically adds brand new locations.
