Southern California-based SpaceX had planned to launch a rocket Tuesday and land its first stage booster back on the Florida coast.
But the launch countdown was stopped with just second to go due to a report of an aircraft in the launch range.
"An aircraft entered the 'keep out zone', which is unreasonably gigantic," Elon Musk wrote in a tweet.
The mission be delayed by at least a day.
The launch of the Falcon 9 rocket is scheduled for 11:56 a.m. California time. The first stage booster’s landing was to be the first onshore landing at Cape Canaveral since December.
The boosters typically land on off-shore drone ships. Separation happens about two and half minutes into the flight.
Sonic booms might be heard in parts of Florida.
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The mission will transport more than 80 commercial and government satellites into space.