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Delta Air Lines

Delta gives Bombardier boost, buying struggling C Series jet

Bombardier's fledgling new jet, the C Series, got a much-needed boost Thursday with one of the world's largest airlines committing to add the plane to its fleet.

Delta Air Lines will become the U.S. launch customer of the single-aisle jet, placing a firm order for 75 of the planes. Delta will add the smallest variant of the jet, the CS100, which seats 108 to 133 passengers depending on the configuration. The Atlanta-based airline has options for 50 additional C Series aircraft and the ability to substitute some of the jets for the larger CS300 aircraft, which seats 130 to 160 passengers.

Delta did not say how many passengers each plane would hold but said each would...