You can use Real ID (with a star) on your DL, passport, military or government ID if that ID has an expiration date. I asked at TSA once if they’d take it (left my purse in the taxi with my DL, but the government ID was hanging around my neck as I’d just come from a meeting) and the TSA guy said “Of course” but the real answer was no, as no expiration date.
Once you get the star, most states will renew with another star even if you renew online.
In my experience, California issued the license with an expired passport, but Florida would not. Colorado issued my Real ID based on the star on my Florida license…but I’d also had a Colorado license in the past.
It isn’t only to get on airplanes, but you need a Real ID to get into fed government buildings, including court houses, and on military bases.