(Adds details of agreement, government concerns, competitive context)
By Brad Haynes
SAO PAULO, July 5 (Reuters) - Boeing Co will buy a controlling stake in the commercial aircraft arm of Brazilian planemaker Embraer SA under a new $4.75-billion joint venture, the companies said on Thursday, cementing a global passenger jet duopoly.
The new company, encompassing Embraer's commercial aircraft and services businesses, should make Boeing the market leader for smaller passenger jets, creating stiffer competition for the CSeries aircraft program designed by Canada's Bombardier Inc and backed by European rival Airbus SE.
The deal values Embraer's commercial aircraft operations, the world's third-largest, at $4.75 billion and Boeing's 80-percent ownership stake in the joint venture at $3.8 billion, the companies said.
Boeing is expected to pay for its share of the venture in cash, according to a person familiar with the matter. The statement gave no indication of any payment Boeing was making under the deal.
Embraer will hold the remaining 20 percent of the venture and keep control of its defense and business jet operations. Concern over U.S. influence in Brazilian military programs had raised red flags in Brasilia, which can still veto the deal.
However, recent signals from Brazil's President Michel Temer and military officials suggested the government is satisfied with the new structure of the tie-up, as long as Brazilian jobs are maintained and Embraer continues to develop new technology.
With timely approval from the government, regulators and shareholders, Boeing and Embraer said they expect to close the deal by the end of next year.
The partnership is expected to add to Boeing's earnings per share from 2020, generating annual pre-tax cost savings of about $150 million by the third year, the companies said.
The deal took shape more than two years after the idea was first presented internally to Boeing's board and reflects a longstanding affinity between the two planemakers, a person familiar with the discussions said.
However, the pressure for a tie-up accelerated when Airbus last year announced it would take control of the CSeries jet from rival Bombardier, which had been struggling in its long-running battle with Embraer in the 70- to 130-seat segment of the market.
For Embraer, the Canadian deal put real marketing weight behind a fragile competitor, while for Boeing the transatlantic tie-up threatened to expand the revenue base and cash-generating potential of its European arch-rival.
The two deals represent the biggest realignment in the global aerospace market in decades. The new two-tier duopoly, putting Airbus and Bombardier on one side against Boeing and Embraer on the other, strengthens established Western planemakers against new entrants such as China, analysts say.
In addition, Boeing and Embraer will deepen a sales and services partnership on the new KC-390 military cargo jet with another joint venture to promote and develop new markets and applications for defense products and services, they said.
Reporting by Brad Haynes in Sao Paulo Additional reporting by Arunima Banerjee in Bengaluru and Tim Hepher in Paris; Editing by Daniel Flynn and Nick Zieminski