Eddie, you are an idiot. A gun dealer can't sell to a criminal or a mental patient. Hasn't been able to for years. Quit blathering.
Try some reading comprehension before you call someone an idiot. I never said they could, I never even mentioned gun dealers, but when a gun dealer sells a gun to a straw purchaser, the manufacturer, distributor and dealer not only make the same profit, but the resulting crime with that gun increases legitimate sales too, it's a twofer. How else do you explain gun manufacturers' and dealers' opposition to universal background checks, which would restrict the second-hand gun market, and stimulate purchases of new guns?
It's also illegal to sell a gun to a criminal or a mental patient, in all fifty states.
Can you really not google "federal gun ownership restrictions"?
It is completely legal in almost all states to sell a gun to a complete stranger, criminal, lunatic or otherwise. It is only illegal if you know or have reasonable reason to believe the buyer is prohibited from possessing firearms. That's a loophole big enough to drive a Mack truck full of straw-purchased guns through.
This lunatic in LAX was just exercising his constitutionally protected right to oppose the government by force that gun nuts maintain is the explicit purpose of the second amendment. They should be cheering him.