This is a bit like the stock market.
Buy low - sell high.
Specifically, in our situation, the aviation market, it is a question of market forces, in other words:
SUPPLY & DEMAND
Takes me back to 1973 in Newcastle when a Dr. Reekie taught me first year Economics.
I could go on about elastic and non-elastics supply & demand curves to explain, in clinical terms, what is happening. ..........