The airliner has two engines at the rear of the aircraft ... what is it ?

If the airliner has two engines mounted on the side of the rear fuselage, then it is probably a Boeing 717, MD-80 variant, a Bombardier CRJ jet airliner or Embraer ERJ jet airliner.

Boeing 717 Spotter's Guide for the Boeing 717

McDonnell-Douglas MD-8X Series of Jetliners Spotter's Guide for the MD-80 Series

Embraer ERJ Series Shown below is an American Eagle ERJ-145 regional jet with its twin jets mounted on the rear of the fuselage. Spotter's Guide for the Embraer ERJ jet airliner

Bombardier CRJ Series Spotter's Guide for the Bombardier CRJ regional jet airliner

Comparing Embraer ERJ and Bombardier CRJ Regional Jets

Shown below is a side-by-side fuselage view of a Bombardier CRJ regional jet (top) and an Embraer ERJ jet (bottom)

Comparison of the nose sections of the Bombardier CRJ (top) and Embraer ERJ (bottom) regional jets

Comparison of the tail structures and shape of the engines of the Bombardier CRJ (top) and Embraer ERJ (bottom) regional jets. The ERJ aircraft have a triangular section on the leading edge of the vertical stabilizer. The CRJ series has a ram air inlet duct at the bottom of the vertical stabilizer.

 

Twin-Engine Fokker 70 and 100

Out of production but still in service are the twin-engine Fokker 70 and Fokker 100. Shown below is a F-100 of Helvetic Airways.