In December 2015, SpaceX did something no commercial aerospace company had done before: It launched a satellite into orbit aboard a Falcon 9 rocket, then safely landed the rocket's lower half, called a first-stage booster, on a launchpad.
Musk was ecstatic, and for good reason. Orbital rockets cost tens of millions or even hundreds of millions of dollars to build, but they're never recycled; they typically smash into the ocean and sink to the bottom.
While SpaceX has filled a large hangar with used rocket boosters over the past year, it has yet to show the boosters can be re-launched.
But the feat now seems imminent.
As we first learned from a post by Eric Berger at Ars Technica, SpaceX could pull off its first-ever launch of a used booster as early as March 29. The rocket part will help ferry a new communications satellite into orbit -- then go for a second touchdown.
"Will attempt a droneship landing [of the booster], too," John Taylor, SpaceX's director of communication, wrote in an email to Business Insider.
If the upcoming mission, called SES-10, goes as planned, it could mark the beginning of an era where SpaceX can reliably offer the lowest cost per pound to get stuff to and from low-Earth orbit and beyond.
How deep will the discount be?
In 2016, Gwynne Shotwell, the president and COO of SpaceX, said customers who launch on a used booster could get 30% off their launch bill.
That means SpaceX customers save about $18.6 million per launch (and SpaceX likely more) when a recycled Falcon 9 rocket booster is used instead of a new one.
Those savings could further compound as SpaceX prepares to debut its gigantic Falcon Heavy rocket system, which will use three boosters --all of which can self-land, be fueled up, and launch again.
This post was updated with comments from SpaceX.
This post originally appeared on Business Insider.