The commercial jet unit has shrunk to 66,500 from 93,000.
The sale comes after the company sold its business jet unit, Raytheon Aircraft, this year.
The driving wheels turn and the jet unit adds propulsion, enabling the craft to climb briskly onto shore.
United created Avolar as a business jet unit in May in an effort to offer alternatives for the business market.
UAL also announced that it would close its business jet unit, Avolar, after finding no viable options for the company.
The business jet unit was created to sell the equivalent of "time share" interests in the planes.
Saudia Airlines has also established a business jet unit, Saudia Private Aviation, that has started taking delivery of four Dassault Falcon 7X long-range trijets.
Hawker Beechcraft was formed in 2007 when Goldman Sachs and the Canadian private equity firm Onex bought Raytheon's private jet unit for $3.3 billion.
The company was formed when Goldman and Onex, the largest private equity firm in Canada, bought Raytheon's private jet unit for $3.3 billion, hoping to seize on the fervor for private jets.
The Gulfstream business jet unit of the General Dynamics Corporation laid off about 200 employees, or 2percentt of the operation's work force, last month as part of a plan to cut costs and increase efficiency.
Boeing, based in Chicago, said it earned $256 million in the quarter, or 32 cents a share, down from $372 million, or 46 cents a year earlier, as its commercial jet unit struggled through the lingering airline industry slump.
