Bit of a random question, but does it matter what form of ID you show to TSA when flying internationally? For example, could you show any of the acceptable forms of ID listed on the TSA website? Or do you have to show a passport when departing on an international flight?
This page from TSA seems to say that you can use any REAL ID for an international flight instead of a passport, but it's a bit vaguely worded.
I know that I could just use a passport at TSA (since I obviously need to have one for an international flight anyway), but I'm specifically wondering if you have to show TSA a passport?
Could I just show them a driver's license instead if that's the ID that's most readily available? Heck, I have a Global Entry card, a Merchant Mariner Credential, and a TWIC card, all of which are qualifying IDs according to TSA... can I just show one of them instead of my passport before an international departure?
In the past, I would think the answer is a simple yes, since TSA was mainly just scanning your boarding pass to see if it was valid, checking to make sure you have a legitimate form of ID, and verifying that your name on the boarding pass matches the name on your ID.
But now TSA is rolling out more comprehensive biometric ID checking system (here's the press release on how this works at BWI) that not only verifies your ID, but also automatically shows the TSA agent what flight you're on without the need to show your boarding pass.
So I'm wondering if, with this new system, you have to show the passport you checked into your flight with in order for the verification to work on TSA's end. My first thought is no, since domestic travelers don't show any form of ID to the airline during check in, so this technology must not rely on that information anyway. But maybe someone has first hand experience with this and could share?
As an aside, does it matter what ID you show TSA if you're a dual citizen (US + another country) flying on an international departure?
I imagine you'd just want to show your US passport (or other form of US-issued ID) since that's the most straightforward, but what if you checked into your flight with your other passport because that's what you want to use on arrival at your destination's border control? Can you still show TSA your US passport anyway? They're obviously not immigration control and don't care about that stuff, but not sure if showing different IDs at check-in and TSA would wreak havoc in their systems and delay you while they sort it out.