Ryanair will deploy more engineers to oversee quality control at US factories building Boeing aircraft for the airline. Michael O'Leary, group chief executive at Ryanair, said the carrier has agreed to step up its activities at the manufacturer's site in Seattle and Spirit AeroSystems in Wichita, where fuselages are built. This comes after a Boeing 737 Max 9 operated by US-based Alaska Airlines suffered a mid-air blowout on January 5. Ryanair does not have any Max 9 aircraft in its fleet, but uses other variants of the 737. Mr O'Leary told reporters at a press conference in London: "I think we all as an industry, Boeing and the airline customers, want to be seen to be investing more in quality control of what's coming off the line in Wichita and Seattle. "Boeing are putting a lot of engineers on the line doing quality control, and we want to be seen as well to be investing in it.