Once the system is available, any traveler who plans to travel to the United States after November 29, 2016 must have a valid EVUS enrollment before traveling, including before arriving at the airport. Travelers should not wait until the last minute to enroll. An enrollment is valid for two years from the date of approval or until the traveler obtains a new passport, whichever comes first. This means that travelers may repeatedly travel to the United States within those two years without having to enroll again. Beginning on November 29, 2016, travelers are encouraged to check the status of their application or enrollment on the EVUS website prior to departing for the airport.