To your second question, have you never flown in an airplane in the US since 9/11? You go through TSA at every airport, regardless of your destination. You have to show an ID at TSA. You don’t have to show a passport to fly domestically obviously, but you can. Case in point, I have a passport but I don’t have a license or other state issued ID. I will now be able to fly domestically without having my physical passport on me.
Checkpoints between states? Just think critically about this for a second.
To your second question, have you never flown in an airplane in the US since 9/11? You go through TSA at every airport, regardless of your destination. You have to show an ID at TSA. You don’t have to show a passport to fly domestically obviously, but you can. Case in point, I have a passport but I don’t have a license or other state issued ID. I will now be able to fly domestically without having my physical passport on me.
Checkpoints between states? Just think critically about this for a second.