alt Hacker NewsI don't know enough about airline finance to understand if this is a simplification or not. Are engine users really billed by the kilonewton-hour or by something simpler like a service hour? It seems like kN-h would be a hard thing to meter to everyone's satisfaction and some simpler proxy would do just as well.
"Under TotalCare, an airline pays Rolls-Royce a fixed rate per engine flying hour." [0] Not quite kN-h indeed. But the idea is similar (and more simple to implement, I suppose): you don't really own the engine, you pay for what you use.
[0] https://www.meritshot.com/rolls-royce-case-study
EDIT: wording