Originally Posted by
canadiancow
I guess it makes sense it's not required, since some domestic flights fly out of international at SFO. But he was very polite about it. I've never had a bad experience with TSA. I know others have, but they've always been pleasant to me.
It's never required, even into an international only terminal. The ID check exists only to confirm identity, TSA has no obligation or right to check ID for anything else. That I may be refused boarding for lack of a passport or refused entry into China for lack of a visa is none of their business.