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I have received a Known Traveler Number (KTN) from the TSA but do not know how to "activate" this pre-check authorization with various airlines. Is it possible to get this information into their systems when bookings for flights had preceded receipt of the KTN?

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    You could try calling the airline up.
    – neubert
    Commented Sep 13, 2014 at 21:12
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    There often is an "add traveler information" section in the booking management interface on an airline's website (I do not know if it can be used to add a KTN, but it's worth a look if you haven't tried already).
    – fkraiem
    Commented Sep 13, 2014 at 21:21
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    According to this TSA blog: blog.tsa.gov/2014/06/… - If you add your KTN to your profile and have reservations that have been already booked, your frequent flyer profile will NOT update past reservations with this number. Solution: contact your air carrier directly to add your KTN.
    – CGCampbell
    Commented Sep 14, 2014 at 3:45
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    On Air Canada, you can add it when checking in online. If it's already in your profile, it's already added when you check in online.
    – Kate Gregory
    Commented Sep 14, 2014 at 16:07
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    WTF is a KTN? IDK. TMA.
    – hippietrail
    Commented Nov 5, 2014 at 10:18

3 Answers 3

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I realize this is an older question, but since none of the existing answers mention it, I just wanted to point out that you can indeed add your KTN on the airline's website for existing reservations, at least in most cases.

This blog post from TSA describes how to add a KTN to an itinerary on each of the airlines that are part of the Pre-Check program.

For example, on Delta (assuming you booked through them,) you can log in to your account on delta.com, go to "My Trips," and select the trip you want to update. You can then add your KTN in the "Secure Flight Passenger Data" section and click "Save." Note that this is not possible with 72 hours of the flight.

This is what the dialog looks like on Delta's website:

Delta Secure Flight Passenger Information Dialog

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Usually it'll be on your ticket - a means to contact your carrier.

If not, calling is usually the most common option, but I prefer email as you get a written confirmation.

If you need a fast response, if they have a twitter account send them a tweet - most airline's social media guys are quick to respond, I've found.

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It will vary by airline. In most cases, you will get the best results by calling the airline as you may not be able to change the secure flight information online after a reservation is ticketed.

I can say that American and Alaska Airlines helped me add my GOES ID number to pre-existing reservations once I was approved and it worked.

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