Size matters…
Okay, the title is a cliche…but in business size (or scale) can mean a lot. Take aircraft for example. An article in the Irish Times reveals how smaller planes like the Boeing 737 Max and the Airbus 320neo are now more fuel efficient and capable of crossing the Atlantic. These smaller planes are not only more fuel efficient, but have less crew and other lower running costs. They can thus offer lower fares than the same or similar flights on larger and more expensive aircraft. According to the article, many airlines from the more western parts of Europe are purchasing such aircraft, with an eye to serving smaller US airports, which are also cheaper to land at.
So, even with these smaller aircraft, it seems airlines will be able to offer cost efficient routes, for both passengers and their bottom line.