Boeing says it will be several weeks before it fully resumes building passenger planes, as factory workers return following a strike that lasted nearly two months. A Boeing spokesperson said Tuesday that the delay in restarting plants in Washington state and Oregon is due to multiple steps needed to resume production.

Boeing handed over 14 airplanes in October and said it will be several weeks before production can fully resume.

After striking for almost two months, workers will return to factory floors in the Pacific Northwest, but must ensure safety procedures are followed as it begins building 737 jetliners.