CHARLESTON, S.C. (WCIV) -- Boeing issued a request for proposal (RFP) to more than a dozens sites/locations to begin choosing where the company will build the 777X, said spokesman Doug Alder.Alder did not identify the locations or the criteria used in selecting the locations."The intent of the process is to determine the location or locations for parts fabrication, fuselage build, join, assembly, paint and delivery of the 777X airplane," he said. "This decision will also encompass the location for the fabrication and assembly of the new composite wing for the airplane. We will determine if this work is done at one location, or separately at different sites."Alder said the company has asked that proposals be returned by mid-December.The company is expected to choose the site for building the 777X early next year.