Ryanair, Boeing's biggest European customer, said it could delay deliveries of some 737 MAX aircraft as it holds out for a trade deal between the U.S. and the European Union. The airline, Europe's biggest by passenger numbers,

Ryanair Holdings Plc said that any tariff cost would be on Boeing Co. to bear, as the Irish budget airline demanded a return to a no-duties regime that that has governed the industry for close to half a century.

Ryanair Holdings (NASDAQ:RYAAY) (OTCPK:RYAOF) on Monday asserted that any tariff-related costs should be absorbed by Boeing (NYSE:BA), as the Irish low-cost carrier firmly called for a reinstatement of the long-standing no-tariff framework that has underpinned the aviation industry for nearly 50 years.