The Wall Street Journal had earlier reported the planned order and said that United was close to ordering dozens of 787 Dreamliners.
Bloomberg had also reported that United was evaluating offers from Boeing and Airbus for up to 100 wide-body jets.
United has an all-Boeing wide-body fleet made up of 96 777s with an average age of 19 years, 53 767s with an average age of 25.1 years and 66 787s with an average age of 5.1 years.
The airline also has 61 narrowbody 757s with an average age of 24.1 years. Of those 21 are of the larger -300 model with a passenger capacity of 234 passengers.
Back in October Boeing flagged that there was strong demand for the 787 and that production would be increased.
Boeing has also mooted new higher gross weight versions of the 787 which is produced in three models – 8, -9 and -10. United has all three models in its fleet with seating from 219 through to 318.
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