I think there is a whole lot of truth here and some confusion. I was TOTALLY mistaken - a valid United States passport WILL allow air travel in the USA AND after October, 2020. So will military ID and various types of other government ID( specific types not listed ).
I had to research three web sites to verify this. Two of the sites would have you believe that after October, 2020 only the REAL ID or EDL or EID would be accepted.
I apologize if I, also, added to this confusion.
However - I do see a lot of confusion coming down the pipeline. With two OFFICIAL SITES indicating the enhanced ID's only - a lot of folks, me included, might research no further.
This confusion is amplified by the use of multiple terminology. REAL ID - EDL - EID
The overriding concern being - if you travel within the USA, be very sure that whatever documents you have will be valid after October, 2020.
Thank God - Its been over fifty years since I've traveled by plane and I have no plans for future air travel.