In January 2016, the 737NG series was still lagging around 900 orders with 7,033 against 7,940 of the A320ceo family. For the new re-engined variants, The 737 MAX series had 3,072 orders since its introduction in August 2011 and the A320neo family got 3,355 in the same time frame or in total 4,471 since its launch in December 2010. The six-month head-start of the A320neo allowed Airbus to rack up 1,000 orders. Through August 2016, Airbus had a 59.4% market share of the re-engined single aisle market, while Boeing had 40.6%; Boeing had doubts on over-ordered A320neos by new operators and expected to narrow the gap with potential orders from established airlines. In July 2017, however, Airbus still had sold 1,350 more A320neos than Boeing had sold 737 MAXs. In August 2018, the A321 had outsold the 737-900 three to one, as the A321neo was again dominating the 737-9 MAX, to be joined by the 737-10 MAX. In October 2019, ultimately, the A320 family surpassed the Boeing 737 to become the highest-selling airliner with a total order of 15,193 and respectively 15,136 aircraft at the end of the month.