SpaceX will return to the space program's historical roots for its Florida launch this weekend.

The private space firm is scheduled to launch an unmanned spacecraft to the international space station on Saturday. Liftoff is scheduled for 10:01 a.m. ET with a backup launch time of 9:38 a.m. ET Sunday.

The spacecraft, called the Dragon, is packed with more than 5,000 pounds of cargo and experiments. It will be launched on a Falcon 9 rocket from Kennedy Space Center in Florida.

SpaceX founder Elon Musk tweeted Friday that a small leak had been found in the rocket's upper stage, but the issue appeared to be resolved ahead of the launch Saturday morning.

1 hour from launch of Falcon 9 & Dragon to @Space_Station. Rocket & weather are go. Launch at 10:01am ET, 15:01 UTC pic.twitter.com/9U3kiikA2H — SpaceX (@SpaceX) February 18, 2017

The mission has special meaning for SpaceX and for space program enthusiasts.

It's the first SpaceX launch from Florida since a Falcon 9 exploded on the launch pad at Cape Canaveral Air Force Station on September 1, 2016. The explosion didn't injure anyone, but it destroyed a satellite that Facebook planned to use to bring internet service to Africa, the Middle East and Europe.

SpaceX did launch a rocket from Vandenberg Air Force Base in California on January 14, 2017, but this will the first from the Cape since the blast.

This will also be the first rocket to lift off from Kennedy Space Center's Launch Complex 39 since the space shuttles were retired in July 2011. The complex also was used to launch the Apollo moon missions.

After the rocket lifts the Dragon spacecraft to orbit, SpaceX will try to land the rocket's first stage back at Cape Canaveral. SpaceX has done this before. It's trying to perfect the technique so that it can reuse its rockets and cut the cost of missions.

NASA says it will take two days for the Dragon to catch up to the space station. Astronauts on board will capture it with the station's 57-foot-long robotic arm.

After the crew unloads the Dragon, it will be packed with trash and other items for return to Earth on March 21. It will splash down in the Pacific Ocean off Baja California.