It wouldn't. How many planes is El Al actually flying? How many planes do the majors in the US fly? This idea does not scale. It puts society on the wrong end of the cost equation.
[edit: I'd love to know what percentage of Muslims are subjected to "Selective Screening" on El Al flights. The TSA/United States can't get away with the same type of behavior that Israel can get away with. We have to treat everyone the same to avoid the taint of "Profiling"]
The TSA operating procedure manual specifies that ALL citizens of 12 countries (almost exclusively Muslim-populated ones) are automatically selected for secondary screening.
Even my American citizen friends with Arabic names get "random screening" the majority of times they fly.