I am renewing my US passport soon so I'll be getting a new number. I don't remember if I used my passport as photo ID when I enrolled in TSA Pre-Check (several years ago), but it occurs to me that if I did, my passport number might be linked to it. I'd hate to get to the airport and find out my KTN/Pre-Check is invalid because my passport number is different now.
So I researched online whether I need to update my KTN/TSA PreCheck with the new number and (surprise!) there is a lot of conflicting info on the interwebs.
Interestingly, the TSA website for Pre-Check doesn't answer this question (unless I missed it). It says if you have questions about Pre-Check that aren't answered on their website, contact the company you enrolled with.
So I called Idemia and the gentleman there said that TSA PreCheck does not use your passport to verify your identity, so you do not need to update them with changes. (Note that I did check Idemia's "update contact information" section of their site and there's no option to update your passport number.)
For good measure, I thought I would just check with Rick Steves travelers: have any of you gone through this process recently and if so would you mind sharing your experience?