Even without it, it requires only a trivial amount of extra computer processor time to retrieve the PNR from the reservation system through a name and flight number or other information. I don't think it's possible to separate it out. As long as the CRS is in the U.S., the data already reside in the US. I don't think it's possible to separate out the API data from the ability of the U.S. government to get the entirety of the PNR.
On November 30th, 2010. See this statement in context.