The CSeries, now known as the Bombardier CSeries, is a family of narrow-body, twin-engine jet airliners designed for regional and short-haul flights. Developed by Bombardier Aerospace, the aircraft features advanced aerodynamics, lightweight materials, and efficient engines, which contribute to lower fuel consumption and reduced emissions compared to older models. The CSeries includes two main variants: the CS100 and the CS300. Both models are designed to accommodate between 100 and 150 passengers, making them suitable for airlines looking to optimize their operations on shorter routes. In 2018, the program was sold to Airbus and rebranded as the A220.