Airbus and Boeing underscored the continued demand strength, principally in the large single-aisle plane sector, with several billion dollars of deals on Tuesday, the second day of the Paris Air Show.
Southwest is an all-Boeing airline.
Airbus, meanwhile, agreed a provisional $5 billion deal with low-priced carrier Viva Air for 50 A320 jets, confirming a Reuters report.
"GECAS' renewed order of our best-selling A320neo aircraft, underscores the continuing strong market demand for these fuel-efficient aircraft", said Fabrice Brégier, COO and President, Airbus Commercial Aircraft. "I am getting to the point where I may run my Pinocchio ad again with the stuff they are saying", Leahy said, referring to an advertising war between Airbus and Boeing in 2012 over conflicting claims on jet performance.
"We are pleased to announce this purchase of 10 additional Boeing 737 "Gamechanger" aircraft, on top of our existing firm order for 100 737 MAXs, with a further 100 options remaining", said Ryanair's Chief Operations Officer, Mick Hickey.
Meanwhile, the aircraft made its Paris flying-display debut to the media and airline industry at this year's International Paris Air Show.
Boeing said demand for that size plane will be principally in the cargo segment and that fewer than 100 passenger models of that type will be delivered during the coming 20 years. Boeing is stretching its 737 in a bid to challenge the sales lead held by Airbus SE in the category of the biggest mono-aisle airliner. Airbus launched a digital services platform on Tuesday, which it said could crunch data to help airlines improve maintenance, reduce fuel burn and optimize routes.
In a symbolic change likely to rankle with its European rival, Boeing ditched its forecast for very large four-engined airplanes such as the Airbus A380 and its own 747-8.
In sales of the larger and more expensive widebody jets, Boeing won 50 sales of the 787 Dreamliner and six of the present model 777 jet. The new jets come as the worldwide aviation industry is showing signs of cooling, with orders for new planes slowing down. "The orders for Airbus are still very much dependent on geopolitics". "We just need lift", Bellew said in a Reuters report. "They're clearly going to come after us on price".
"We are delighted to announce this new engagement with Boeing. You have to have bigger aircraft".
Previously, Boeing said only that the wing would be carbon fiber composite.