[hueving]

I've entered the US through SeaTac, MSP, ATL, and SFO. In each of those, I never encountered TSA checkpoints until a connecting flight. If it is the final destination of your flight, you do not interact with TSA at all (unless you scream bomb in the airport or something).

[eitally]

Agreed. I've entered via SFO, SJC, ATL, JFK, LGA, MIA, HOU, and DFW and it's only CBP at the customs & immigration check... then onward to baggage rescan & TSA security checkpoint.