Please forgive me if I posted this question in the inappropriate forum
Recently, I was watching a documentary concerning Post-9/11 America. They mentioned that, should terrorists again hijack a plane and attempt to crash it into civilian areas, the US Air Force would be mobilized to shoot the plane down. This would kill both the terrorists as well as the civilians on the plane, but many more civilian lives would be saved.
If I am not mistaken, I remember reading something in the Catechism saying that one should not murder or unjustly harm another even if the lives and safeties of others are at stake.
So, is shooting down a hijacked plane against the faith?