Mark Thompson recalls other NFZs:
The U.N. — but actually, largely the U.S. — maintained no-fly zones over northern and southern Iraq for about a decade following the first Gulf War in 1991. … The Iraqis never succeeded in shooting down a U.S. or allied plane patrolling the no-fly zones — they flew more than 250,000 sorties — despite the promise of cash bounties for any Iraqi who downed a plane. But the U.S. Air Force did succeed — after misidentifying a pair of aircraft as Russian-built Iraqi Hind helicopters — in downing two U.S. Army UH-60 Black Hawks in 1994, killing all 26 aboard.