A Frankfurt-to-Zurich flight spends roughly eight minutes in cruise. The rest — climb, descent, approach — is pure fuel burn with almost nothing to show for it in seat-miles covered.
That geometry is why Lufthansa Group is cutting 20,000 short-haul flights from its schedule through October 2026. The trigger was Iran-conflict-driven jet fuel prices, which have effectively doubled. But the real story is what that doubling does differently depending on where you are in the flight.
At normal prices, fuel represents 20–30% of airline operating costs. On a long-haul widebody, the bulk of that burn happens in cruise — the efficient, aerodynamically settled phase where modern turbofans are doing exactly what they were designed to do. Short-haul routes never get there. Climb and descent consume a disproportionate share of total fuel on any flight under two hours, so when the price of kerosene doubles, the cost curve on a 90-minute hop to Vienna or Brussels doesn't just rise — it inverts. Revenue stays roughly fixed. Margin goes negative.
Lufthansa's long-haul widebody operations are untouched. A Frankfurt-to-Singapore sector absorbs the fuel shock across 13 hours of efficient cruise. The math still works. The math on short-haul was already fragile.
That's the harder truth embedded in these cuts. Twenty thousand flights don't get cancelled because they were healthy routes that got unlucky. They get cancelled because they were already marginal — propped up by pre-shock fuel economics, dependent on volume to justify their existence, and carrying no buffer for a cost spike of this magnitude.
The Iran shock didn't break these routes. It just made visible what the spreadsheet already knew.