We are going around in circles so I will focus in the following comment, which is Luton specific so on topic.
Say Easyjet, TUI UK & Wizzair UK move out, along with their jobs it only reduces Luton prosperity.
Who has said anything about Luton airlines with bases moving out? Oh and Luton is not prosperous compared to surrounding towns. Those earning the money don’t live in Luton while those working at the airport and suffering from in-work poverty while living in deprived areas do.