The company was founded in 1925 by Frederick Rentschler, and has its headquarters in Hartford, Connecticut. In addition to aircraft engines, Pratt & Whitney manufactures fixed gas turbines for industry and power generation, marine turbines, and railway locomotive engines.

There have been many famous Pratt & Whitney engines, including:

Reciprocating engines:

• Wasp
• Hornet
• Wasp Jr
• Twin Wasp Jr
• Twin Wasp
• Double Wasp
• Wasp Major - powering many postwar large bombers and transports.

• The JT8D which powered many of the second-generation jet airliners, including the Boeing 727, Douglas DC-9 and Boeing 737.
• The JT9D, as found in the original Boeing 747.

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