Guy Norris/LOS ANGELES

UNITED AIRLINES has radically revised its large Boeing order, shifting the emphasis away from more 777s to 747-400s and, at the same time, paving the way for its first 747-600Xs.

Negotiations for the long-anticipated order were originally based around an additional 17 777s, up to 13 747s and five 757s, and 20-30 smaller aircraft in the 737/Airbus A319 category (Flight International, 22-28 May).

The deal, which is still awaiting clearance pending the final choice of smaller aircraft, now covers up to $2.5 billion-worth of firm orders. This includes as many as 37 747s, but only two 777s. The 757 firm orders have increased to six.

In all, United has placed firm orders for 19 747s, plus options on a further 11. It is understood that positions have been reserved on seven more. Of the 19 firm orders, only 12 have been designated with the Pratt & Whitney PW4056 engine. The outstanding seven aircraft, although pencilled in as -400s, are due for delivery after 2000, and are expected to be converted to stretched 747s. It is believed that United plans to convert the orders to higher-capacity 747-600Xs, rather than the longer-range 747-500X.

Airline sources say that P&W will be asked to "-re-compete for the last batch of 747 engines" if they are converted to the 747-X.

"The 747, 757 and 777 part is a done deal," says the source.

Source: Flight International