Dear Artsyman, as Broke said, no commercial airliners are designed to accept battle damage. The A300 - like practically all airliners - has three fully independent, redundant hydraulic systems. But they are not protected like they are on some military transports.
That what makes a C-17 military transport much more expensive than similar sized commercial transports. And a C-130J Herc almost as expensive as a B-747-400. I know because I have just bought three of them - for operation in Afghanistan and such - well, I bought them together with 4,999,999 other Danes.
Okay the price of "my" Hercs also includes various active, partly classified self defense systems which with a very high degree of certaincy would have prevented the Iraqi missile to reach its goal. In addition to battle damage oriented redundancies, armor of critical areas and all such things.
I think that this incident told the people in charge, that only protected military transports should be used in Iraq until the country becomes a safer place. They are the only planes which are designed for that sort of treatment.
Happy landing, Preben Norholm
Always keep your number of landings equal to your number of take-offs