Wide bodies aircraft also known as twin aisle aircraft are larger aircrafts being manufacture today.
They are known as wide bodied due to the size of fuselage which allow more space configured in the cabin and contains two aisles between seats.
Regional Aircrafts is a type of aircraft which is accommodating around 100 passengers or less. It is often used by airlines to providing services between smaller cities in short distances. Many airlines use regional aircrafts to serves the cities with low volume demand; since the operation cost for regional aircrafts are often lower than the others.
The smallest commercial aircraft used by airlines generally with less than 20 seats. Commuter Aircraft is also known as Air Taxi. Since this aircraft is designed to provide short distance services, which therefore amities on board are limited such as lack of lavatory.