Taking a stroll down the high-rent district of military aviation reveals a number of airframes with shockingly expensive operating costs, and some that have even more staggering purchase prices. The cost of aerial supremacy has never been cheap, but in the era of fifth generation fighters and the arms race for the most superior stealth, costs keep getting higher and higher. Interestingly, fighter jets are far from the most costly warplanes in the world. That crown goes to strategic assets like the United States Air Force's 747-based Air Force One and other specialized mission platforms. Much of the cost of…