Hello, and welcome.
Yes, you will need your TSA Precheck number or "KTN" (Known Traveler Number) when you make your reservations. If you can't locate your paperwork, you can call the phone number below or visit the link below, to find your KTN number:
Call Universal Enrollment Service at 855- 347- 8371 Hours are Mon-Fri 8AM to 10PM Eastern time.
I hope this helps!
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This number here takes you directly to a representative to where you can get your Pre Check number.
GOES Help Desk at 1-***-***-**** and is the quickest way to retrieve the number.
Make sure that you add it to all your reservations or trusted traveler accounts as just adding it to say Delta will not put it on if you fly on American.