Analysis of information sources in references of the Wikipedia article "팰컨 9 / 팰컨 헤비 발사 목록" in Korean language version.
The April 17 F9R Dev 1 flight, which lasted under 1 min., was the first vertical landing test of a production-representative recoverable Falcon 9 v1.1 first stage, while the April 18 cargo flight to the ISS was the first opportunity for SpaceX to evaluate the design of foldable landing legs and upgraded thrusters that control the stage during its initial descent.
[The] partnership between NASA and SpaceX is giving the American space agency an early look at what it would take to land multi-ton habitats and supply caches on Mars for human explorers, while providing sophisticated infrared (IR) imagery to help the spacecraft company develop a reusable launch vehicle. After multiple attempts, airborne NASA and United States Navy IR tracking cameras ... captured a SpaceX Falcon 9 in flight as its first stage [fell] back toward Earth shortly after second-stage ignition and then reignited to lower the stage toward a propulsive "zero-velocity, zero-altitude" touchdown on the sea surface.
But the Falcon 9 is not just changing the way launch-vehicle providers do business; its reach has gone further, prompting satellite makers and commercial fleet operators to retool business plans in response to the low-cost rocket. In March 2012, Boeing announced the start of a new line of all-electric telecommunications spacecraft, the 702SP, which are designed to launch in pairs on a Falcon 9 v1.1. Anchor customers Asia Broadcast Satellite (ABS) of Hong Kong and Mexico's SatMex plan to loft the first two of four such spacecraft on a Falcon 9. [...] Using electric rather than chemical propulsion will mean the satellites take months, rather than weeks, to reach their final orbital destination. But because all-electric spacecraft are about 40% lighter than their conventional counterparts, the cost to launch them is considerably less than that for a chemically propelled satellite.
A second anomaly was a stage-one fire on the "Octaweb" engine structure during a flight in December.
To space and back, in less than nine minutes? Hello, future.
The next version of Falcon 9 will be used for everything. The last flight of version 1.0 will be Flight 5. All future missions after Flight 5 will be v1.1.
Orbcomm requested that SpaceX carry one of their small satellites (weighing a few hundred pounds, versus 드래곤 at over 12,000 pounds)... The higher the orbit, the more test data [Orbcomm] can gather, so they requested that we attempt to restart and raise altitude. NASA agreed to allow that, but only on condition that there be substantial propellant reserves, since the orbit would be close to the space station. It is important to appreciate that Orbcomm understood from the beginning that the orbit-raising maneuver was tentative. They accepted that there was a high risk of their satellite remaining at the 드래곤 insertion orbit. SpaceX would not have agreed to fly their satellite otherwise, since this was not part of the core mission and there was a known, material risk of no altitude raise.
[The] partnership between NASA and SpaceX is giving the American space agency an early look at what it would take to land multi-ton habitats and supply caches on Mars for human explorers, while providing sophisticated infrared (IR) imagery to help the spacecraft company develop a reusable launch vehicle. After multiple attempts, airborne NASA and United States Navy IR tracking cameras ... captured a SpaceX Falcon 9 in flight as its first stage [fell] back toward Earth shortly after second-stage ignition and then reignited to lower the stage toward a propulsive "zero-velocity, zero-altitude" touchdown on the sea surface.