Hello! Thank you for using Just Answer. I am James, and I will be assisting you. First, sorry for the delay. There were no TSA Experts online when you posted your question.
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ANSWER: To answer your question, the number that starts with TT is the one you use as your Known Traveler Number when making reservations, in order to be eligible for TSA Precheck during your flights.
The UE ID is what is used to login to your TSA PreCheck account. But the TT number is ***** PreCheck number that you use while making travel arrangements.
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