If it doesn't matter then the hijacking scenario doesn't provide a good rationale for restricting the rights of citizens to carry
Coupled with the fact that hijackers/terrorist have to be stopped on the ground, if cc was legalized for airplanes, to keep the scenario I discribed or something similar from happening would be probably impossible... in that case...
...Nor the right to carry on a airplane.
Which brings me back to the question I asked earlier:
Of those that think we should legalize cc on commercial airlines,
"How would you stop hijackers from boarding a plane armed?"