The F-22 Raptor is unquestionably the most advanced combat aircraft the world has ever seen. It's also by far the most expensive. But whether it's the hands-down best is up for debate, especially after multinational Red Flag combat exercises in Alaska. In the words of one German Eurofighter Typhoon pilot, "we have had a Raptor salad for lunch."

It's cheaper and more efficient for an airline to use one single large aircraft instead of several smaller aircraft, which was the initial motivation behind Boeing's venerable 747. Airbus cranked things up a notch with its truly gigantic double-decker A380, and a patent filed by Boeing last month suggests that a future generation of the 747 may follow suit.

Just because Doc Brown's future has no roads doesn't mean the dream of a flying car is dead. With flying cars like the Terrafugia, the idea still lives. But, if you absolutely must have yourself a flying car, you can buy this vintage one from the 1950s for over a million bucks.

Remember that crazy 18-rotor personal helicopter proof of concept from e-volo that we wrote about last November? Looks like the company is ready to take the next step towards making a consumer version of this thing, and ultimately, it may not even be that crazy at all.