I guess the planes are "extra" so would be really cheap from capital expenditure point of view.
I wonder if the aviation fuel tax can be thought of as helping European aviation industry, if A320 based single aisle aircraft have better range than Boeing 737 based ones so can be used more for smaller routes if fuel gets more expensive. ATR also has a pretty big market share for regional turboprops that could supplant regional jets.
737 Max has less range than the equivalent models in the A320neo series, but it’s also a slightly lighter plane, and so on routes under a certain distance the Max tends to use less fuel.
