'Transportation Security Administration', is an agency of the U.S. Department of Homeland Security that exercises authority over the safety and security of the traveling public in the United States

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How does one inform airlines of one's KTN, if the KTN was issued after a booking had been made?

I have received a Known Traveler Number 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 ...