Regional airliners are smaller aircraft designed to operate short-haul flights, typically connecting smaller cities to larger hubs. They usually seat between 30 to 100 passengers and are often used by airlines to serve routes that may not be profitable for larger jets. These planes help improve accessibility and provide essential air travel options for communities. Many regional airliners are operated by regional airlines, which may be affiliated with major carriers through codeshare agreements. Popular models include the Bombardier CRJ series and the Embraer E-Jet family. These aircraft are known for their efficiency and ability to operate from shorter runways.