Watch the world’s biggest airplane taxi down a runway as it preps for its first flight

Stratolaunch, the world’s biggest airplane, hit a new milestone recently, taxiing down the runway at 46 mph. While that may not sound like much, it’s worth watching the video to see this 500,000-pound beast with twin fuselages and a wingspan of 385 feet lumbering down the concrete. The chase cars look like Micro Machines next to this thing.It’s a big improvement over a low-speed test conducted last December, in which the Stratolaunch traveled down a runway at just 28 mph. Prev