You will "soon" be able to add a digital version of your U.S. passport to your iPhone, according to Jennifer Bailey, vice president of Apple Pay and Apple Wallet. Bailey reiterated that the feature is coming soon during her keynote at the Money20/20 USA conference in Las Vegas on Sunday. On its iOS 26 page, Apple says the delayed feature will be "coming later this year".
I can only speak to my local tri-state area but most people’s drivers licenses can’t be used to fly domestically. People that have their passports just use those to fly and don’t really bother to get the REAL ID