That doesn't mean it's not required, it just means airline staff aren't doing their jobs. Here is United's page, this is standard policy for all domestic flight

That doesn't mean it's not required, it just means airline staff aren't doing their jobs. Here is United's page, this is standard policy for all domestic flights: https://www.united.com/en/us/fly/travel/trip-planning/us-travel-document-requirements.html https://www.united.com/en/us/fly/travel/trip-planning/us-tra... Edit: And here's the TSA notice clearly stating the policy - https://www.tsa.gov/travel/security-screening/identification https://www.tsa.gov/travel/security-screening/identification