I know pretty much everyone here has a Passport which will work. But you need to know you will not only need to carry it for flights inside the US, but also to enter Federal buildings in the US...........
apnews.com
Don’t have a REAL ID yet? That could cause you travel headaches after May 7
The deadline to get a REAL ID is fast approaching after years of postponements and delays. Starting May 7, your license or identification card will need to be REAL ID-compliant to fly domestically in the U.S.
