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.

Thanks all. I always do put my known traveller number but I may need to check to see if it matches my registered name exactly.

This is critical, your membership needs to match how you book with the airline (PNR is "Passenger Name Record" which is your real ticket in "the system.")

I have no idea why, but United always appends my middle initial to my first name, and it's somehow never caused a problem (LemmyLives David Johnson turns into LemmyLivesD Johnson on my tickets.) Delta never did this. Southwest and Lufthansa don't do it.

Check your boarding passes for the dreaded SSSS marker, too. I've only gotten that flag leaving Japan or Istanbul, never (that I recall) domestically, I have no idea why. The way you purchase tickets may be clicking you up a risk notch, which triggers Pre Check removal on flight legs.

With certain (usually international) airlines, even not having a salutation on your PNR, but having "MR." on your pre-check profile will be enough for it to throw an inconsistency that triggers airport fun. Look at *all* the data elements between your accounts.

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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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this. You have to tell the airlines your KTN . They won’t look it up for you.

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.

They can add it at the airport check in, but as others have pointed out, set up a frequent flyer account for the airline you’re using and add it there.