The head of United Airlines, Scott Kirby, said he has his doubts about whether Boeing can deliver its 737 Max 10 airplanes due to the manufacturer’s safety and quality problems. Kirby made his comments in an interview with CNBC. United had earlier ordered 277 Boeing Max 10 along with an option to purchase an additional 200 in the future. However, the order has been delayed. In a call with the investors, Kirby said that the airline is not quite cancelling the order for Max 10, but at the same time, it does not anticipate that it would receive the planes. He further explained, “We are taking it …