Domestic Flights in US

ID will do.

waiting for some one else to also reply , so i can buy the ticket
thanks

You will either need to bring a passport, or a driver license, social security card, current HIV test and your mother.

its a DOMESTIC flight
why would you need a passport?

why would you even think that you would need a passport?

Because we've changed a lot of security rules in the past two years. This doesn't happen to be one of them, but it's a reasonable question for someone who hasn't flown before, or hasn't flown in the last couple years.

Btw, if you're not a US citizen (i.e. you came here with a passport and lost it, or came here without a passport), you're probably going to have problems.

This is from TSA website:

Check to make sure you:
Bring a boarding pass ticket or ticket confirmation such as a printed itinerary as well as a government-issued photo ID. Children under the age of 18 do not require an ID. At some airports only boarding passes will be accepted to enter the passenger checkpoint.
Bring evidence verifying you have a medical implant or other device if it is likely to set off the alarm on the metal detector bring evidence verifying this condition. Although this is not a requirement it may help to expedite the screening process.
Have removed prohibited items such as pocketknives metal scissors with pointed tips (metal or plastic scissors with blunt tips are permitted) and tools from your carry-on baggage. Double check the list of prohibited and permitted items to determine what can be placed in carry-on or checked baggage if you have any questions.
Have reviewed TSA's guidance on unlocking checked baggage.

http://www.tsa.gov/public/display?theme=1

Hope that helps

why dont you just ask the person you buy the ticket from?

even if you don't need it right now..get a passport for the future. You never know when you might need it and you don't want to be in a position where you have to turn down a trip because you don't have one.