Nothing too explicit, a plane breaks in half and passengers are heard calling out for God. A man is hit by artillery and we briefly see his wound.
Images of blood splattered on windows, from other planes exploding, and references to "someone's guts splattered all over the window". In another scene, a thermos of tomato soup is splattered all over the inside of the cockpit with the pilot/co-pilot trying to figure out who got hit, before they realize what it was.