Meanwhile, relatively low fuel prices have damped demand for new, fuel-efficient wide-body jets such as the 777 and 787 and contributed to a glut of second-hand models.
Boeing fell 0.7 per cent to $133.39 at 12:29 p.m. in New York, paring a drop of as much as 1.4 per cent. Airbus declined 1.1 per cent to 53.83 euros at the close in Paris.
Qatar Airways intends to follow through on a 2011 order for 50 Airbus A320neo and A321neo planes, which have a combined value of $6.4 billion at list prices, Al Baker said. But he also took a swipe over issues with the aircraft's geared turbofan engine, which is made by United Technologies's Pratt & Whitney unit, saying the delays left him with "no alternative" but to order the "reliable" Boeing narrow-body planes.
"We never renege on contracts that we sign," Al Baker said. "The aircraft that we are ordering today will serve this ever-expanding network."
Qatar is also ordering 30 of Boeing's 787-9 model and 10 777-300ER jets, valued at a combined $11.7 billion at list prices before discounts that are customary for large aircraft purchases It is Boeing's largest twin-aisle sale this year, providing a little more visibility into plans for the 777, the planemaker's largest twin-engine aircraft, as well as for the Dreamliner, the company's marquee carbon-fiber jet.
The aircraft that we are ordering today will serve this ever-expanding network.
Boeing CEO Dennis Muilenburg said last month that current sales campaigns could determine whether Boeing boosts Dreamliner output -- and whether a dearth of orders will force it again to slow assembly of current-generation 777 models before an upgraded version debuts in 2020.
Al Baker has signaled his growing frustration with Airbus in recent months, threatening to switch a Qatar Airways order for planes in the A320neo family to Boeing 737 Max jets. He has declined to take delivery of the first Airbus narrow-bodies because of an engine cooling issue.
Airbus has also drawn Al Baker's ire for its struggles to meet delivery deadlines of the A350, the European company's most advanced jetliner, which competes with the 777 and 787 Dreamliner. The state-owned airline was the first buyer of the new Airbus wide-body.
Boeing's deal with Qatar Airways was forged after the US approved sales by Boeing and Lockheed Martin to Persian Gulf allies, including as many as 72 Boeing F-15 jets to Qatar. The fighter-jet sale is subject to approval by the US Congress.