DUBLIN, Sept 12 (Reuters) - Boeing ( BA ) will likely

hit its target of producing 40 737 aircraft per month by the

spring, but the price of the aircraft is likely to rise

materially following a deal with unions, the head of major

customer Ryanair said on Thursday.

Group Chief Executive Michael O'Leary told Ryanair's annual

general meeting that he estimated the U.S. firm is currently

producing around 20 737 aircraft per month and that Ryanair may

take delivery of five fewer jets than planned by December.

(Writing by Conor Humphries; editing by Jason Neely)