Please read the following and plan accordingly.
I have never carried my pilot’s license in my wallet, but I needed it yesterday. Returning to my plane at San Luis Obispo Airport, I couldn’t get back on the tarmac without a driver’s license ID and a pilot’s license. I said my license was in the plane. They said that TSA would allow them to escort pilots to their planes without verification of license, so I got a ride in a golf cart. San Louis Obispo is Class D. Imagine what you have to do to get back to your plane at SFO.