California's SpaceX company has successfully re-flown a segment from one of its Falcon 9 rockets.
The first-stage booster, which was previously used on a mission 11 months ago, helped send a telecommunications satellite into orbit from Florida's Kennedy Space Center.
It marks an important milestone for SpaceX in its quest for re-usability.
Traditionally, rockets are expendable - their various segments are discarded and destroyed during an ascent.
The California outfit, in contrast, aims to recover Falcon first-stages and fly them multiple times to try to reduce the cost of its operations.
And to emphasise this point, Thursday's booster was also brought back under control to land on a barge stationed out in the Atlantic.
"I think it's an amazing day for space," said Elon Musk, the chief executive of SpaceX.
"It means you can fly and re-fly an orbit class booster, which is the most expensive part of the rocket. This is going to be, hopefully, a huge revolution in spaceflight."
Getting away from expendable rockets has been a long quest.
Famously, Nasa's space shuttle system was partially re-usable.
Its white solid-fuel strap-on boosters, for example, would parachute into the Atlantic after each launch. The casings of these boosters were then refurbished and re-used numerous times.
And yet the complexities of servicing the shuttle system after every flight swamped any savings.
SpaceX hopes its simpler Falcon 9 rocket can finally deliver a practical commercial solution. It believes its technology will eventually permit rapid turnaround, with boosters flying perhaps 10 times before being retired; maybe even up to 100 times with a certain level of refurbishment.
"With this being the first re-light we were incredibly paranoid about everything," Mr Musk said.
"The core airframe remained the same, the engines remained the same - but any auxiliary components that we thought might be slightly questionable, we changed out. Now our aspiration will be zero hardware changes, re-flight in 24 hours - the only thing that changes is that we reload propellant."
SpaceX hopes its simpler Falcon 9 rocket can finally deliver a practical commercial solution. It believes its technology will eventually permit rapid turnaround, with boosters flying multiple times before being retired.
Other players are following close behind. The Amazon entrepreneur Jeff Bezos already has a re-usable sub-orbital rocket and capsule system that he has successfully launched and landed five times.
Mr Bezos now plans a recoverable orbital rocket called New Glenn. And United Launch Alliance, which puts up the majority of America's national security payloads, is in the process of designing a new vehicle that will return its engines to Earth via parachute.
All this is welcome news for the likes of Luxembourg satellite operator SES, which is having to queue up for rocket rides and wait many months to get its valuable telecoms spacecraft in orbit and earning revenue.
"It's a big deal for us. If we can get reliable re-usability then we will get better management of the manifest," said Martin Halliwell, the chief technology officer for SES.
"We made a little bit of history today, actually. We just opened the door to a whole new era of spaceflight,"