(Reuters) - Boeing Co's
The approval came at a board meeting in Chicago that coincided with Boeing's annual shareholder meeting on Monday, the Journal said.
Boeing intends the 777X to be an improvement on its existing 777 models for long-haul service.
The decision allows Boeing to begin formally negotiating deals with airlines for the new jet, the daily said.
A Boeing spokeswoman could not be immediately reached for comment outside regular business hours.
(Reporting by Neha Alawadhi in Bangalore; Editing by Daniel Magnowski)