In October 2005, SpaceX announced plans to launch Falcon 9 in the first half of 2007. The initial launch would not occur until 2010.

SpaceX spent its own capital to develop and fly its previous launcher, Falcon 1, with no pre-arranged sales of launch services. SpaceX developed Falcon 9 with private capital as well, but did have pre-arranged commitments by NASA to purchase several operational flights once specific capabilities were demonstrated. Milestone-specific payments were provided under the Commercial Orbital Transportation Services (COTS) program in 2006. The NASA contract was structured as a Space Act Agreement (SAA) "to develop and demonstrate commercial orbital transportation service", including the purchase of three demonstration flights. The overall contract award was US$278 million to provide three demonstration launches of Falcon 9 with the SpaceX Dragon cargo spacecraft. Additional milestones were added later, raising the total contract value to US$396 million.

In 2008, SpaceX won a Commercial Resupply Services (CRS) contract in NASA's Commercial Orbital Transportation Services (COTS) program to deliver cargo to ISS using Falcon 9/Dragon. Funds would be disbursed only after the demonstration missions were successfully and thoroughly completed. The contract totaled US$1.6 billion for a minimum of 12 missions to ferry supplies to and from the ISS.

In 2011, SpaceX estimated that Falcon 9 v1.0 development costs were approximately US$300 million. NASA estimated development costs of US$3.6 billion had a traditional cost-plus contract approach been used. A 2011 NASA report "estimated that it would have cost the agency about US$4 billion to develop a rocket like the Falcon 9 booster based upon NASA's traditional contracting processes" while "a more commercial development" approach might have allowed the agency to pay only US$1.7 billion".

In 2014, SpaceX released combined development costs for Falcon 9 and Dragon. NASA provided US$396 million, while SpaceX provided over US$450 million.

Congressional testimony by SpaceX in 2017 suggested that the unusual NASA process of "setting only a high-level requirement for cargo transport to the space station [while] leaving the details to industry" had allowed SpaceX to complete the task at a substantially lower cost. "According to NASA's own independently verified numbers, SpaceX's development costs of both the Falcon 1 and Falcon 9 rockets were estimated at approximately $390 million in total."
SpaceX originally intended to follow its Falcon 1 launch vehicle with an intermediate capacity vehicle, Falcon 5. The Falcon line of vehicles are named after the Millennium Falcon, a fictional starship from the Star Wars film series. In 2005, SpaceX announced that it was instead proceeding with Falcon 9, a "fully reusable heavy-lift launch vehicle", and had already secured a government customer. Falcon 9 was described as capable of launching approximately 9,500 kilograms (20,900 lb) to low Earth orbit and was projected to be priced at US$27 million per flight with a 3.7 m (12 ft) payload fairing and US$35 million with a 5.2 m (17 ft) fairing. SpaceX also announced a heavy version of Falco…

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Rockets from the Falcon 9 family have a success rate of 99.33% and have been launched 448 times over 15 years, resulting in 445 full successes, two in-flight failures (SpaceX CRS-7 and Starlink Group 9–3), one pre-flight failure (AMOS-6 while being prepared for an on-pad static fire test), and one partial failure (SpaceX CRS-1, which delivered its cargo to the International Space Station (ISS), but a secondary payload was stranded in a lower-than-planned orbit). The active version of the rocket, the Falcon 9 Block 5, has flown 380 times successfully and failed once (Starlink Group 9–3), resulting in the 99.74% success rate.

In 2022, the Falcon 9 set a new record with 60 successful launches by the same launch vehicle type in a calendar year. This surpassed the previous record held by Soyuz-U, which had 47 launches (45 successful) in 1979. In 2023, the Falcon family of rockets (including the Falcon Heavy) had 96 successful launches, surpassing the 63 launches (61 successful) of the R-7 rocket family in 1980. In 2024, SpaceX broke their own record with 134 total Falcon flights (133 successful) accounting for over half of all orbital launches that year.

The Falcon 9 has evolved through several versions: v1.0 was launched five times from 2010 to 2013, v1.1 launched 15 times from 2013 to 2016, Full Thrust launched 36 times from 2015 to 2015. The most recent version, Block 5, was introduced in May 2018. With each iteration, the Falcon 9 has become more powerful and capable of vertical landing. As vertical landings became more commonplace, SpaceX focused on streamlining the refurbishment process for boosters, making it faster and more cost-effective.

The Falcon Heavy derivative is a heavy-lift launch vehicle composed of three Falcon 9 first-stage boosters. The central core is reinforced, while the side boosters feature aerodynamic nosecone instead of the usual interstage.

Falcon 9 first-stage boosters landed successfully in 405 of 417 attempts ( 97.1%), with 380 out of 385 ( 98.7%) for the Falcon 9 Block 5 version. A total of 383 re-flights of first stage boosters have all successfully launched their second stages and, all but one, their payloads.
• Flight 1, Dragon Spacecraft Qualification Unit — 4 June 2010, first flight of Falcon 9 and first test of Dragon,
• Flight 3, Dragon C2+ — first cargo delivery to the International Space Station,
• Flight 4, CRS-1 — first operational cargo mission to the ISS, and the first demonstration of the rocket's engine-out capability due to the failure of a first-stage Merlin engine,

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F9 is a two-stage, LOX/RP-1-powered launch vehicle.
First stage

Second stage
Both stages are equipped with Merlin 1D rocket engines. Every Merlin engine produces 854 kN (192,000 lbf) of thrust. They use a pyrophoric mixture of triethylaluminum-triethylborane (TEA-TEB) as an engine igniter.

The booster stage has 9 engines, arranged in a configuration that SpaceX calls Octaweb. The second stage of the Falcon 9 has 1 short or regular nozzle, Merlin 1D Vacuum engine version.

Falcon 9 is capable of losing up to 2 engines and still complete the mission by burning the remaining engines longer.

Each Merlin rocket engine is controlled by three voting computers, each having 2 CPUs which constantly check the other 2 in the trio. The Merlin 1D engines can vector thrust to adjust trajectory.
The propellant tank walls and domes are made from an aluminum–lithium alloy. SpaceX uses an all friction-stir welded tank, for its strength and reliability. The second stage tank is a shorter version of the first stage tank. It uses most of the same tooling, material, and manufacturing techniques.

The F9 interstage, which connects the upper and lower stages, is a carbon-fibre aluminium-core composite structure that holds reusable separation collets and a pneumatic pusher system. The original stage separation system had twelve attachment points, reduced to three for v1.1.
Falcon 9 uses a payload fairing (nose cone) to protect (non-Dragon) satellites during launch. The fairing is 13 m (43 ft) long, 5.2 m (17 ft) in diameter, weighs approximately 1900 kg, and is constructed of carbon fiber skin overlaid on an aluminum honeycomb core. SpaceX designed and fabricates fairings in Hawthorne. Testing was completed at NASA's Plum Brook Station facility in spring 2013 where the acoustic shock and mechanical vibration of launch, plus electromagnetic static discharge conditions, were simulated on a full-size test article in a vacuum chamber. Since 2019, fairings are designed to re-enter the Earth's atmosphere and are reused for future missions.
SpaceX uses multiple redundant flight computers in a fault-tolerant design. The software runs on Linux and is written in C++. For flexibility, commercial off-the-shelf parts and system-wide radiation-tolerant design are used instead of rad-hardened parts. Each stage has stage-level flight computers, in addition to the Merlin-specific engine controllers, of the same fault-tolerant triad design to handle stage control functions. Each engine mi…

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