While I was a Federal Skymarshal for 2 years in the early 70's, my biggest concern was the possibility of a terrorist creating enough of a disturbance in the cabin to draw us out of our plain-clothes cover, making us vulnerable to being disarmed by another terrorist. This was a concern of mine, even though we always pre-briefed the crew that we would not allow ourselves to become involved in non-hijacking altercations.
It was and still is a very boring job, and I am still concerned that some hapless Skymarshal may be disarmed by a terrorist.
I am therefore very relieved that a substantial number of pilots will be armed, hopefully in the not-too-distant future. The pilots know that their primary job is to fly the aircraft and safely land it as soon as possible, should there be a hijacking. They will not leave the cockpit to do battle with the terrorists, and they will be shooting their weapons only as a last resort if the cockpit door is being breached. If some terrorist is attempting to squeeze through a reinforced door that is being forced open, I doubt that it will be that difficult to ventilate him from a distance of inches or, at most, a few feet.
The question was raised about the Captain's authority in allowing weapons in the cockpit. As I understand it, the new law does not allow any airline management or anyone else, including the Captain, to bar a qualified pilot crewmember from having access to an authorized firearm. The most likely quarrel between the Captain and First Officer will probably be who gets to leave his seat to defend the cockpit door
Also, be assured that the airline's number one priority is to design and install an armored cockpit door that will be almost impossible to breach. This project will probably take about 2 more years to complete.
For those of you who advocate that we make the passenger cabin inacessible from the cockpit "like the Isralies do" , be aware that the Isralies have been able to make these modifications to large, intercontinental airliners. This type of modification is simply not practical for smaller, short-range airliners. Also keep in mind that certain types of emergencies, such as manual landing-gear extension, require the presence of one cockpit crewmember in the passenger cabin.
One thing that I would like to know is: Are we requiring all foreign carriers who fly into the USA to have reinforced-armored cockpit doors? If anyone knows the answer to this question, I hope they post it here.