SpaceX scrapped the launch of two test satellites as part of its ambitious "Starlink" space Internet project.
Named "Microsat-2a" and "Microsat-2b", the satellites were meant to be launched at 14:17 UTC on Wednesday from Vandenberg Air Force Base in California, the U.S..
But the launch has been postponed for 24 hours as strong wind was detected.
SpaceX has been talking about this project, which is expected to include thousands of satellites, since 2015.
The mission will be carried out by a Falcon 9 rocket, famous for its reusable technology.
The launch was originally scheduled on Feb. 12, and has been delayed three times for reasons including a prolonged checking and unsuitable weather conditions.
Also expected to be launched is the Spanish observation satellite named "Paz" – the word for "peace" in Spanish. This satellite can take images of the Earth with a 25-centimeter resolution.
Paz will "serve both government and commercial needs," according to SpaceX.