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Falcon 9 v1.1 is the second version of SpaceX's Falcon 9 rocket-powered spaceflight launch system. It was developed in 2010–2013, and made its maiden launch in September 2013. It is both designed and manufactured by SpaceX, headquartered in Hawthorne, California. It is currently the only active rocket of the Falcon rocket family.

Falcon 9 v1.1 was a new vehicle design, with 60 percent more thrust and weight than the Falcon 9 v1.0 launch vehicle. It flew for the first time on a demonstration mission on the sixth overall launch of any Falcon 9 on September 29, 2013.

Both stages of the two-stage-to-orbit vehicle use liquid oxygen (LOX) and rocket-grade kerosene (RP-1) propellants. The Falcon 9 v1.1 can lift payloads of 13150 kg to low Earth orbit, and 4850 kg to geostationary transfer orbit, which places the Falcon 9 design in the medium-lift range of launch systems.

The Falcon 9 v1.1 and Dragon capsule combination is being used, beginning in April 2014, to resupply the International Space Station under a contract with NASA. SpaceX is developing the Falcon 9 v1.1 to be able to carry humans and has a contract with NASA for developing and testing several additional technologies to enable it to carry NASA astronauts. No contracts for NASA astronaut missions have yet been signed.