The world's largest airplane, developed by aerospace venture Stratolaunch, flew into the air for its first flight test on Saturday.
"A historic milestone for the #Stratolaunch team with this record setting aircraft taking flight! This is about going to the edge of space and beyond!" tweeted Thomas Zurbuchen, Associate Administrator for NASA Science Mission Directorate.
"I only wish the late @PaulGAllen could see this - his memory and impact lives on," he added.
Dozens of photographers, industry bloggers and aerospace enthusiasts gathered this week to catch a glimpse of the unique twin-fuselage plane.
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