Originally Posted by Wally Bird

Simply driving by T1/T2 at LAX on a typical day presents several hundred targets. Strap or carry an IED into the terminal and mingle in the 'rat maze' prior to security then flip the switch. Drive your VBIED to the curb at just about any airport and set it off. As Oklahoma City demonstrated, there is no need to drive into the terminal even if you could (see Glasgow UK).

What measures does the TSA take to prevent any of the above ? The DHS ?

That there have been zero IEDs inside the US since the beginning of the WOT is because nobody is trying it, not because anybody is preventing it. And I agree, there many other softer and more horrifying target locations than airports.