Investing.com-- Ryanair (LON: 0RYA ) chief executive Michael O’Leary has warned that the airline may delay deliveries of Boeing (NYSE: BA ) aircraft if new U.S. trade tariffs significantly raise costs, the Financial Times reported on Tuesday.

O’Leary told the FT that Ryanair could postpone the delivery of 25 jets scheduled from August until at least March or April 2026 if the U.S. imposes new import tariffs.

His comments come as the aviation industry faces mounting uncertainty due to U.S. President Donald Trump’s proposed 10% levy on imported finished aircraft and additional 25% tariffs on steel and aluminum, key components in aircraft manufacturing, the FT reported.

CEO of Europe’s largest low-cost airline highlighted an intensifying dispute over who would shoulder tariff costs — manufacturers or airlines.

Delta Air Lines Inc (NYSE: DAL ) has also said it would defer Airbus (EPA: AIR ) deliveries if tariffs are applied, according to the report.

The sector, historically shielded from trade barriers, is now grappling with potential disruptions to global supply chains, the report added.