One of NASA's main delivery companies made a triumphant comeback seen up and down the East Coast on Monday night, launching its first space station shipment from Virginia since a rocket explosion two years ago.

It was the first flight of Orbital ATK's unmanned Antares rocket since the Oct. 28, 2014, blast that wrecked the pad and destroyed everything on the space station supply run.

The launch provided a show for sky gazers along much of the East Coast. Reports poured in via Twitter from observers in Washington, Baltimore, Philadelphia, New York, and even Raleigh, North Carolina.

For Antares' long-awaited return, the pad underwent a $15 million restoration, and the rocket got new Russian engines to replace the vintage ones from a half-century earlier.

As the Antares streaked through the night sky from NASA's Wallops Flight Facility, it appeared as though all the work had paid off. Launch controllers applauded when the supply ship reached orbit and victory was declared.

"It is great to be back," said Frank Culbertson, president of Orbital ATK's space systems group.

NASA Administrator Charles Bolden described the launch as "magnificent" and personally thanked the Orbital ATK team.

"It's been a very difficult two years, and I can't imagine what those of you in the Orbital team went through. I can't imagine how long you were holding your breath tonight," Bolden told the launch control crowd. "But you know, we made it and that's what's all important."

Getting a lift from the Antares was Orbital ATK's Cygnus capsule, loaded with more than 5,000 pounds of food, equipment and research, including some experiments to study flames in space and the robotic toy ball Sphero, part of an educational effort.

The Cygnus — named after the swan constellation — will have to hang around in orbit until Sunday before delivering the goods. That's because three astronauts are awaiting launch from Kazakhstan on Wednesday, which would get them to the space station on Friday. NASA wants the new crew to settle in before the Cygnus pulls up.

This will be the sixth Cygnus to arrive at the orbiting outpost since 2013. While the Antares was being redesigned, Orbital ATK made good on two deliveries using another company's rockets flying from Cape Canaveral.

NASA's other commercial shipper, SpaceX, has made nine station deliveries since 2012, but is currently grounded, pending an investigation into last month's rocket explosion during prelaunch testing at Cape Canaveral.

Given the riskiness of space flight, Culbertson and other Orbital ATK officials expressed nervousness before the launch, but said they had full confidence in the rocket. Although it took longer to resume flights at Wallops than expected, he noted, "it was done right, and that was the most important thing."

NASA has been relying on Orbital ATK and SpaceX to keep the space station stocked ever since the shuttles retired in 2011.

Next up will be private flights for the station crews, as the space agency works on getting astronauts to Mars in the 2030s.

SpaceX and Boeing are building capsules to carry U.S. astronauts to the 250-mile-high station; those launches are expected in the next couple of years. Until then, NASA will keep flying its astronauts on Russia's Soyuz spacecraft.

The space station is currently home to an American, a Russian and a third astronaut from Japan. They will be joined by an American and two Russians.

Orbital ATK weathered brief hurricane delays over the past 1½ weeks, then a bad cable at the pad on Sunday bumped the launch by a day.

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Online:

Orbital ATK: www.orbitalatk.com

NASA: www.nasa.gov/mission_pages/station/main/index.html