Chance Miller at 9to5Mac did an excellent summary of where, in theory, you can use digital IDs and where you cannot. The problem, as always, is the humans.
Even though TSA checkpoints are absolutely supposed to accept Digital IDs, on a recent trip, my particular TSA agent wasn’t having it. His words were something to the point of, “That’s not going to cut it. I need to see a real identification.” I guess I could have argued with him, but I’m not sure arguing with TSA agents is a good idea.
Because I was worried about this, I had my actual driver’s license with me, but if I hadn’t, I’m not so sure I would have gotten on a plane that day.