TOKYO, Nov 12 (Reuters) - Boeing Co is hopeful its key machinist union will vote for a labour contract to secure production of the 777X in Washington State, but will look at alternatives, including building the wings in Japan if the deal is rejected, an executive said on Tuesday

"We are hopeful," said John Tracy, the U.S. aircraft maker's chief technology officer. "If not ratified we will consider all other alternatives," he said, adding that included the possibility of taking production of the wings out of the United States to Japan.