Is there any difference between a commercial airliner and the other locations nucanuck mentioned? Let's all take a moment to try to think of one.
OH! I remember! Airports are secured with metal detectors, X-ray machines, and armed guards and are, therefore, gun free in more than name only.
This site features a rebuttal to this editorial: http://www.CampusCarry.com
Scroll down--it's the top post, below the introductory paragraph and menu bar. It's part of the "News/Analysis" section.