Boeing and United Airlines confirmed Thursday the big order that's been rumored for months: "150 brand new Boeing airplanes," said United CEO Jeff Smisek.

The order includes 100 of the forthcoming MAX-9 jets and 50 current-generation 737-900 ERs, Smisek said. United's order is worth $14.7 billion at list prices, though undoubtedly the actual price is considerably lower.

Smisek joined Boeing CEO Jim McNerney and the new head of Boeing's Commercial Airplanes unit, Ray Conner, at the press conference -- held in the city where bothhave their headquarters, not at the Farnborough Air Show where most of the world's aviation industry has been cutting deals and inspecting hardware all this week.

With today's order, said McNerney, the 737 has now surpassed 10,000 orders,
"an unprecedented milestone in the Jet Age."

The order includes additional options that were not disclosed today.

Smisek noted that United has existing orders from both Airbus and Boeing that are still to be delivered. These include the 787 Dreamliner, and Smisek said "Boeing has guaranteed us that we will get our first 787 in late September."

The United order is bigger than any Boeing announced at the Air Show. Its tally as of Wednesday was 98 firm orders for the MAX: 23 from Virgin Australia and 75 from Air Lease Corp. It also disclosed previous commitments - not firm orders - for 100 MAXs from leasing company GECAS; 20 MAXs from ALAFCO; and a mix of 15 MAXs and 10 current-generation 737NGs from Avolon.