It could be good in a plane but you would probably be in lots of trouble if you were caught with one.
Not that you need polymer weapons to bring weapons on a plane anyway.
I saw in a documentary journalists that brought 3 handguns and a handgrenade into a plane without security detecting them.
It was in a Paris-New York flight, they even contacted a US congressman after that to show him how the security was a joke but he refused to have anything to do with that ... :|
lol.. the last plane i flew on, i was like 4 years old and it was a little single engine Cessna.
im not flying unless i have to.