DUBLIN, May 1 (Reuters) - Ryanair would look for

an alternative aircraft supplier if U.S. tariffs materially

affect the price of planes it has ordered from Boeing ( BA ),

chief executive Michael O'Leary said in a letter on Thursday,

adding that he would consider Chinese planemaker COMAC.

"If the US government proceeds with its ill-judged plan to

impose tariffs, and if these tariffs materially affect the price

of Boeing ( BA ) aircraft exports to Europe, then we would certainly

reassess both our current Boeing ( BA ) orders, and the possibility of

placing those orders elsewhere," O'Leary said in a letter to a

U.S. lawmaker seen by Reuters.