Tom Ricks lists six things to consider before proposing one:

[T]he Iraqi no-fly zones are not a good precedent to cite. I actually went out and looked at the operation of the northern no-fly zone in October of 2000. I came away thinking that one reason that no American aircraft were shot down in the Iraqi no-fly zones was because Saddam Hussein really did not want to-that is, he did not want to provoke America. The anti-aircraft shots that were taken were wide on purpose. A better parallel might be Serbia, which (aided by a smart Hungarian national who now is a baker) managed to down an F-117 stealth fighter aircraft in March 1999 with an SA-3 anti-aircraft missile.  

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