Shares of Boeing Co. /zigman2/quotes/208579720/composite BA +2.43% sank 1.7% in premarket trading Wednesday, after the aerospace and defense giant reported a fourth-quarter loss of that widened to more than $8 billion, to miss expectations by a wide margin, while revenue fell a little less than forecast, amid strength in its defense, space and security business. The net loss was $8.44 billion, or $14.65 a share, after a loss of $1.01 billion, or $1.79 a share, in the year-ago period. Excluding non-recurring items, the core per-share loss was $15.25, compared with the FactSet loss consensus of $1.64. The results reflected a $6.5 billion charge on the 777X program and a tax valuation allowance, which was partially offset by a lower 737 MAX customer considerations charge. Revenue dropped 15% to $15.30 billion, above the FactSet consensus of $15.06 billion. Commercial airplanes revenue fell 37% to $4.73 billion, missing expectations of $4.87 billion; defense, space and security revenue increased 14% to $6.78 billion, exceeding forecasts of $6.39 billion; and global services revenue dropped 20% to $3.73 billion, topping expectations of $3.72 billion. The stock has rallied 30.2% over the past three months through Tuesday, while the Dow Jones Industrial Average /zigman2/quotes/210598065/realtime DJIA -0.39% has gained 12.7%.