DUBLIN, Jan 13 (Reuters) - The head of the world's

largest aircraft leasing company, AerCap ( AER ), said on Monday

that potential new trade tariffs floated by U.S. President-elect

Donald Trump could hit supply chains and hinder efforts by

Boeing ( BA ) to generate much-needed cash.

The biggest priority for Boeing ( BA ) and U.S. regulators should

be to streamline certification of the 737 MAX 7 and 737 MAX 10

jets as well as the long-delayed 777X, CEO Aengus Kelly told

Reuters on the sidelines of the Airline Economics conference.