Your Global Entry Known Traveler Number (KTN) is **only the 9-digit PASSID**. Do **not** include the spaces or the trailing letters and numbers, such as `BC321`. [CBP confirms that the PASSID is nine digits.](https://www.help.cbp.gov/s/article/Article1296)

For example, if your card shows `123456789    BC321`, enter **`123456789`** in the airline’s Known Traveler Number field.