RE:Who is new A220 client who was asking new long range ?
range increase is mostly due to using AB formula on calculating range rather than bbd. Bbd uses standard industry numbers while AB tweaked theirs to increase range. However if you were to install additional fuel tank at cost of luggage space then a220 would become the longest ranged single aisle aircraft in AN stable. More then the proposed a321xlr. https://leehamnews.com/2019/05/30/airbus-a220-gets-increased-range/#more-30246