TSA Pre Check...

If you have an active Global Entry number, you have Precheck.

Only times I've had it not go through is when the name on the ticket doesn't exactly match TSA Pre number i.e. my middle name isn't on it or only middle initial. Would just double check that stuff.

From what I understand is that you still need to enter the Global entry information into your frequent flyer account (Delta, United, AA, Southwest, etc.) and the system will recognize it and issue the pre-check mark when you check-in.

The system does not look for your information unless you provide it during your booking.

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The problem is I only get Pre-Check about half the time I fly. Anybody know what's up with this?

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Usually once out of every 4-5 times I fly, my precheck doesn’t show up when I check in day before the flight. I always input my name and number just the same each time and always double check for accuracy before submitting and booking. I have no idea why this happens.

Each time it happens I’ve been able to log in and manually enter it after checking in. First time it ever happened, the counter agent was able to add it while checking in our large bag right before headed to security.

It’s happened with booking flights both with my TSA known traveler number and has happened since with Global entry number. It’s annoying, but I’m always able to successfully add it within 24 hrs of the flight if it fails to go through.

You don't have to enter it each time. You should be saving your known trveler ID number into each frquent flyer account you have. If you travel for business make sure that your travel coordinator has your known traveler ID number as well as your frequent flyer account numbers and hotel loyalty membership numbers.