Big rumblings are going on at America's airplane capital -- the Boeing Co. aircraft factory north of Seattle. Engineers are moving forward with building the world's biggest twin-engine jetliner. They're calling it the 777-9X, the first aircraft of the 777X family.

Big rumblings are going on at America’s airplane capital — the Boeing Co. aircraft factory north of Seattle. Engineers are moving forward with building the world’s biggest twin-engine jetliner. They’re calling it the 777-9X, the first aircraft of the 777X family.