Lufthansa Mulls A380 Reactivation or 777-300ER Adoption
simpleflying.com
simpleflying.com
tl;dr: opportunity cost.
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.