Killers in the Sky: The 5 Most Lethal Combat Aircraft Going to War in Syria

The air war over Syria has seen the combat debut of some of the most advanced warplanes from around the world. No less than three new fighter types from the United States and Russia have dropped weapons in anger for the first time. But those new jets are accompanied by their older stablemates, which are often the mainstays of the war on both sides.

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