Regional jets are small, narrow-body aircraft designed for short to medium-haul flights. They typically seat between 30 to 100 passengers and are used by airlines to connect smaller cities to larger hubs. These jets are efficient and can operate in airports with shorter runways, making air travel more accessible. Manufacturers like Bombardier and Embraer produce popular models of regional jets, such as the CRJ Series and E-Jet Series. These aircraft are known for their fuel efficiency and lower operating costs, which help airlines maintain profitability while serving less populated routes.