Guam is a protectorate of the USA, but is out of the country. I think you will need one.
You can check at the post office.
yes
A passport.
None needed to travel within the US.
A passport is not needed to fly from one US state to another. However, you will need a photo ID of some sort to board the plane.
Passport is a requisit.
You can fly to Mexico, but, you won't be able to fly back to the US.
Seeing as Texas and Louisiana are both US States, no you do need a passport to fly between them.
No, only when you leave the borders of the US.
No. To fly an airplane you need a pilot's license. To fly on an airplane within the USA, NTSA guidelines require a passport (foreign or US), US passport card, or US drivers license or non-drivers license.
YES
Not if staying in country.
You do not need a passport to fly to another state in the US You DO need a passport to travel anywhere out of the US ie Mexico, Canada ect...