There absolutely is precedence for this. The US shot down an Iranian airliner in 1988: http://en.wikipedia.org/wiki/Iran_Air_Flight_655 http://en.wikipedia.org

There absolutely is precedence for this. The US shot down an Iranian airliner in 1988: http://en.wikipedia.org/wiki/Iran_Air_Flight_655 http://en.wikipedia.org/wiki/Iran_Air_Flight_655 And the Russians shot down a Korean airliner in 1983: http://en.wikipedia.org/wiki/Korean_Air_Lines_Flight_007 http://en.wikipedia.org/wiki/Korean_Air_Lines_Flight_007