If you're approved, at the end of the interview, you'll immediately be enrolled into the program and be given your Known Traveler Number (KTN).
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Of course, you'll also need to be arriving from a flight abroad, but at least you can complete the interview without an appointment. It is possible to handle the Global Entry walk-in interview on arrival if you plan.
Global Entry is everything that TSA PreCheck is and more. If you have Global Entry, you'll automatically also get TSA PreCheck and all of its benefits. On top of that, you'll get to avoid the general customs line when returning to the U.S. from abroad.
Global Entry can save you time at U.S. Customs and Border Protection. Members skip processing lines and access automated kiosks instead. This can mean you spend less time waiting in line to be screened by a CBP officer, getting you on your way faster.
In summaryTo use Global Entry kiosks, you just need your passport or permanent resident card. However, if you're planning on traveling to Canada or Mexico, consider adding the NEXUS or SENTRI programs to your membership and remember to bring your card with you!