We just checked into this and a passport will do fine even for domestic. But if one doesn't want to carry a passport then that person should get the enhanced license for free when renewing the driver's license. If not done at renewal then there is a charge to get one. Not sure what that cost is. This info given to hubby 2 days ago when re renewed his driver's license in the state of RI
Other options for Domestic travel are:
Passport Card
Global Entry Card
Enhanced License depending on cost- Wash St is not free
Or any other government issued picture ID
