Originally Posted by
sam250240
Thanks guys for the answers, I think I'll be fine with a driver's license. I'm traveling from BOS to SFO.
No need to say "I think" here. I never carry a passport on domestic trips. My driver's license is always sufficient, including this specific route many times.
(My wife was once cleared in the reverse direction, at SFO heading for BOS, using her YMCA membership card. She pulled it out by mistake, as it was next to her DL, and didn't realize it until she was putting it back into her wallet. We have no idea if the agent knew what it was and figured it was good enough, or just didn't notice.)