Space Exploration Technologies Corp., better known as SpaceX, said Friday it was now aiming for a May 19 liftoff of its Falcon rocket and Dragon capsule. It will be the first commercial cargo run to the space station.
The launch of the supply ship had been scheduled for Monday but was delayed for more software testing. The test flight is already three months late.
NASA used to stockpile the space station through the shuttles, but the fleet was retired last summer. The space agency wants commercial providers to carry up supplies and eventually astronauts.
In the meantime, NASA is paying Russia to ferry astronauts to the space station.