My wife has an Arkansas Driver's License, though it's not one of the new REAL ID licenses.

The [DHS](https://www.dhs.gov/real-id-public-faqs) says:

> Starting January 22, 2018, passengers who have driver's licenses issued by a state that is **not yet compliant with REAL ID** and that has not received an extension will need to show an alternative form of acceptable identification for domestic air travel. Please see TSA's website for a list of acceptable forms of identification. Passengers who have licenses issued by a state that is compliant or that has an extension to become compliant with REAL ID requirements may continue to use their licenses as usual. For a list of states already in compliance or with an extension visit DHS's REAL ID webpage. DHS continually updates this list as more states come into compliance or obtain extensions. 

The [TSA](https://www.tsa.gov/travel/security-screening/identification) says:

> Adult passengers 18 and over must show valid identification at the airport checkpoint in order to travel.

> - Driver's licenses or other state photo identity cards issued by Department of Motor Vehicles (or equivalent)

> ...

(and then links back to the DHS site).

Which one of these do I believe? The TSA doesn't list anything else besides a passport - she doesn't currently have one, so does that mean that we need to either get an updated REAL ID driver's license, or a passport? Or is a current Arkansas Driver's license valid for travel?