Not in the context of someone smuggling a weapon through a security checkpoint. At least not unless they're certain that it's small enough not to trigger the detector.
That said I will note that it is generally illegal to possess such nonferrous weapons regardless of circumstance.
How does a plastic pistol open the cockpit door? It is proof to small calibers. You might shoot someone in the plane and then you will be subdued and ghaddafied with a SkyMall magazine. Not the most effective form of terrorism.
Countries that didn't create the TSA also had a reduction in terrorism.
I agree. Such a pistol won't even get you many shots before catastrophically failing.
But upthread it was suggested that metal detectors are sufficient to stop weapons and a discussion of 3D printed guns followed. Nonmetallic weapons (and other tools) of all sorts are possible, 3D printed or otherwise.
If you want a gun you can use more than a couple times need metals. However if the goal is one shot plastic is good enough. Even plastic bullets will work - not well, but one well placed/timed shot is all we are talking about.
also the rails on the lower, the barrel, etc.