Europe is moving beyond slogans on zero-emission aviation. A broad coalition has asked the European Commission to build a full ecosystem for zero-emission and hybrid aircraft (ZEHA), including market incentives, airport infrastructure mandates, and operating cost support. The key shift is that carbon intensity (CI) per megajoule will become the operating currency, not just a reporting metric. Hybrid aircraft will blend electric power with sustainable aviation fuel (SAF), forcing operators to track CI from both sources precisely. Regulators will need auditable data on the CI of SAF, electricity, and hydrogen used per flight. This demands new trust infrastructure for chain-of-custody verification, moving beyond today's patchwork certificates. The article argues that while ZEHA aircraft get the headlines, carbon intensity will decide what is viable on the balance sheet. Europe's policy bet is that if operators can prove they are cleaner, they will be rewarded. The rest of the world will watch how convincingly Europe can verify every cleaner flight.
