The launch of a pair of NASA satellites has been delayed until at least February due to an ongoing Boeing strike and launch range maintenance, NASA announced.

NASA’s Cloudsat and Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) spacecraft had been scheduled for a Nov. 7 launch aboard a Boeing Delta 2 rocket. The mission was delayed until December when more than 1,000 members of the International Association of Machinists and Aerospace Workers walked off the job Nov. 2 and now has run into a scheduled two-month closure of the launch range at Vandenberg Air Force Base, Calif., for maintenance beginning Dec. 19.

Boeing also continues to study the cause of problems encountered during testing of the flight termination system batteries.

It will take NASA and Boeing about 15 days to prepare for launch once all issues are resolved, and the earliest the mission can take place is February, NASA said.

Cloudsat, which will study the vertical structure of clouds and cloud properties, and CALIPSO, a joint mission with France, will examine the effects of clouds and aerosols on changes in the Earth’s climate.