I added my US passport to my Pixel's wallet app in June. It's neat and let's you see what data is transmitted over NFC, and lists some details about the signed

I added my US passport to my Pixel's wallet app in June. It's neat and let's you see what data is transmitted over NFC, and lists some details about the signed certificate for the data (seems they do only 2 weeks of validity for each cert signature, and the app fetches a new sig automatically) but I have yet to come across TSA agents advertising acceptance of digital IDs, so typically I default to my passport card.