There was a post from last year outlining 11 airports with adult-sized changing tables, and now there are 15! Hopefully the pace will pick up, but at least there is progress.

https://wheelchairtravel.org/airports-with-adult-changing-tables-usa/

wheelchairtravel.org

15 Airports in the USA That Have Adult Changing Tables - Wheelchair Travel

A number of airports in the United States are installing adult changing tables, so that every passenger can use the bathroom with dignity while traveling.