Boeing's new 787 Dreamliner takes its first flight, and the engineers who built its engines watch to see whether years of work hold up in the air. The film follows Rolls-Royce through the design, assembly, and testing of the Trent 1000, the engine chosen to power the Dreamliner, at manufacturing plants in Derby and elsewhere in the UK. Cameras move through the factory floor and test facilities where components are machined to tolerances measured in fractions of a millimeter, and engineers explain how a single engine program can take a decade from drawing board to commercial flight. The film treats Rolls-Royce not just as a manufacturer but as a workplace, following some of the thousands of people whose jobs depend on getting a jet engine right, since a failure thousands of feet in the air is not one you get to fix afterward. It closes on the Trent 1000's real test: the Dreamliner's inaugural flight, and whether the engineering underneath it performs as promised.