What I thought was pretty cool was that the explosions seemed to combined smoke and fire together; it wasn't separate smoke and separate fire. I also thought the traveling explosion after the first plane was hit at low level was very cool - seemed to explode, then skid along the ground and then really explode. Just seemed very realistic to me. And the Snake Eyes hitting the runway seemed to be a different graphic affect altogether, with much more smoke than the aircraft explosion/crash.
Pretty impressive for such an old graphics engine, isn't it? Doesn't this engine date from the 90s?