Originally Posted by
Gunga Din
One reason is they're hard to find. All the bus slots are taken for many years out.
Where are you getting your data?
Allegiant just ordered 12 A320CEO aircraft and jetBlue 30 A321NEO for deliveries beginning in 2019. Airbus year to date (Jan 1-Jul 31) delivered 280 A320 family airplanes (2 319CEO, 153 320CEO, 11 320 NEO, 114 320CEO) and the Mobile, AL plant isn't even running at full capacity yet.
Not saying you're wrong but curious where you get 'many years out' numbers from.