For the subsidiaries of United Aircraft, and for countless other manufacturing firms, World War II was an exercise in how to attempt to meet limitless demand for production (as well as for R&D).

In many cases a compromise was reached in which the government paid partially or fully for the expansions in the form of tax breaks and accelerated depreciation.

[7] At the close of the war, jet engines and helicopters were both big new things whose coming growth many companies hoped to get in on.

The 1960s brought new challenges, from more complex technology and bigger, more expensive aircraft to more mature markets with stiffer competition from GE, Rolls-Royce, and SNECMA.

On the military side of the business, the TFX joint-procurement program led to the General Dynamics F-111 Aardvark powered by the Pratt & Whitney TF30.

Five seven car sets were built by MLW for Canadian National Railway In the 1970s the jet engine manufacturers found that their products for the commercial (airline) market had been commoditized to a greater extent than in previous decades.

[8][9] Producers had to compete on service, warranties, and eventually even by buying entire aircraft and then leasing them to the airlines.