Good point. It is accepted at 27 large airports that represent maybe 75% of passenger volume.
According to TSA it is now accepted at 250+ airports:
To use a Digital ID at any of the
250+ airports, add your
acceptable state-issued eligible driver’s license or identification card to your phone using a
TSA-approved digital ID app or to your phone's digital wallet.
(Still not clear on the difference between the two TSA sources of information (they list specific airports, but now say 250+.)
My guess is that it is now available at most airports and so they stopped updating their list, but I have not yet had a chance to test that theory yet.
As a TSA PreCheck user, my most recent experience at one such airport was next level better using face ID called TSA PreCheck Touchless ID. It's a pilot and currently relies on a passport-linked photo that’s stored in the Customs and Border Protection database - so not everybody, but worked for me and my spouse. Just stand still for a second in front of a camera - that's it and they said "Ok" and waved me in. No need to pull out iPhone, double-click, hold near the NFC area, and then repack iphone to go though the x-ray machine.
I have Nexus and so qualify for PreCheck Touchless ID, but I find it only offers it about 20% of the time, but the NFC chip on my Nexus card works way more often. In addition, everyone with a digital ID will be eligible for this, as opposed to just those with Global Entry, Nexus and PreCheck.
I wonder whether it will ever be useful with all police in any state.
Yes, and likely pretty soon. Most states already have departments with departments that issue mobile phones to their officers and/or hand held devices to scan licenses and issue tickets. This will just be one more part of that system.
Unlikely. There are so many reasons this is better for all involved, that it will not take too long for it to be universal.
Police often do more than just glance is drivers licenses. They often enter the number into the system in their petrol car.
This makes that much easier. They can know instantly if this is a valid ID, without having to worry about entering information incorrectly.
NFC will require state, county and local departments spend the money to obtain the necessary equipment for every officer to have NFC reader connected back to a central database, perhaps via the patrol car - in which case the system in the petrol car would also require an investment.
Most departments are already moving this direction. This lets officers issue printed (and increasingly emailed) citations, without the issue of entering wrong information in a paper logbook. Many of these systems use mobile phones as their handheld devices and are already in place. The increase in accuracy generates enough additional citation revenue and savings by cutting staff who used to do data entry to easily cover the costs of these systems.