If Boeing machinists vote down the company's pay offer for a third time it could drive Boeing deeper into financial uncertainty.

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.

Tens of thousands of striking Boeing machinists voted Monday to ratify a new contract, ending their seven-week work stoppage.

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.