Can you travel with just your I'd? From MD AZ?

Yes you can. After 2023 you will need a REAL ID though

Thank you so much! It's my first time flying and I was nervous about it but this is very reassuring!

Yes you can. You can also travel to any U.S. state and some U.S. territories (like the U.S. Virgin Islands, for example) with only a U.S. ID

Yes

Yes you can. It's still a local flight