SSSS on airline ticket (or checkered ticket for southwest) extra security check.?

Question

When you go through the extra security at an airport, what does the process actually include?

Answer 1

It varies from airport to airport but usually they pat you down and go through your bag by hand and with a metal detector.

Answer 2

you are will probably have a pat down search  go a machine that blows air or possibly one of those new body scanner machines,

and  a more though inspection of you and your carry ons