If all options are exercised, the deal could amount to more than $7 billion for Chicago-based Boeing, although such agreements usually involve steep discounts.
The Singapore flag carrier disclosed the orders and options Wednesday in a statement to the island nation's stock exchange.
Airline officials plan to use the extended-range twinjets on medium and long-haul routes. They say the planes will enable Singapore Airlines to expand its combined passenger and cargo capacity by four to six percent a year.
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