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SpaceX has postponed Wednesday’s scheduled launch from California’s Central Coast with 64 smallsats, electing to keep the Falcon 9 rocket on the ground until at least Sunday to wait for improved weather conditions.

The Falcon 9 rocket’s eighth flight of 2016 took off from Cape Canaveral early Sunday with the Japanese JCSAT 16 communications satellite, setting a new mark for the most launches made by SpaceX in a single year.

The first 10 satellites for Iridium’s next-generation mobile voice and data relay network have been fueled, joined with their deployment module and encapsulated inside the clamshell-like nose cone of a SpaceX Falcon 9 booster for launch as soon as next week from Vandenberg Air Force Base in California.