The first Bombardier CRJ550 entered service with United Airlines on 15 regional routes out of its Chicago hub. Bombardier describes the CRJ550 as the first 50-seat airliner with three classes. It is a new CRJ Series model, with its type certificate based on the CRJ700. United has ordered 50 examples for routes to small cities with high numbers of business passengers. Each has ten business-class seats, 20 premium economy and 20 economy. Mark Broadbent.
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