Boeing 737 series

From above; Boeing 737-900, Boeing 737-600, Boeing 737-800, Boeing 737-700

Type mission : short to medium range narrowbody airliner
Manufacturer : Boeing
Facts : Boeing 737 series is the most successful airliner ever made. With 6300+ delivered and 2000+ still in order, Boeing 737 series is the best selling airliner in history. There is a 737 taking off or landing every five seconds somewhere in the world. This Boeing 737 series are so popular that chance is high that you too have been on one before.

There are many version of Boeing 737 such as :
First generation :
Boeing 737-100; the first design of 737, entered service in 1969 as 100 passengers short range airliner. Back then, 737-100 designed to compete with DC-9 and BAC-111. Compared to its competitor, 737-100 has six abreast seats rather than five.
Boeing 737-200; stretched version of 737-100 with capacity of 115 passengers. This 737-200 then way exceeded the 100 version on sales amount.

Boeing 737-200 is easily distinguished from other 737 type by its cigar-like engine

Second generation :
Boeing 737-300; entered service in 1984, this 737-300 is the second generation of 737 family that comes with stretched 737-400 and shortened 737-500. Boeing 737-300 has new more efficient CFM turbofan engine and capacity of 141 passengers. Later on, this 737-300/400/500 version got in close competition with Airbus A320 series which have more advanced technologies, more performance and range. But despite of the close competition, Boeing 737-300/400/500 series still held the title of best selling airliners.
Boeing 737-400; a stretched version of 300 version with maximum capacity of 188 passengers. Some version of this 737-400 also featured longer range.
Boeing 737-500; a shortened version of 737-300. With capacity of 100 passengers, 737-500 is a direct replacement for 737-200.

Boeing 737-300 with CFM engine

Third generation or 737 next generation :
Boeing 737-600; entered service in 1996, this 737-600 is the third generation 737 or also known as 737 next generation which is more efficient and has new 777-like cockpit. Boeing 737-600 came side by side with stretched 737-700. Boeing 737-600 is a further developed 737-500, the smallest version of 737 family.
Boeing 737-700; entered service in 1996, Boeing 737-700 is a further developed 737-400, the base version of 737 family. Some versions of this 737-700 featured long range option.
Boeing 737-800; entered service in 1998, Boeing 737-800 is a further developed 737-600, the stretched version of 737 family.
Boeing 737-900; the latest and most advanced 737, entered service in 2001. Boeing 737-900 is the largest in 737 family with over 200 passengers capacity.

Latest Boeing 737-900ER with winglet

Capacity :
Boeing 737-100; 100 passenger one class high density
Boeing 737-200; 115 passengers typical two class or 130 passenger one class high density
Boeing 737-300; 128 passengers typical two class or 141 passenger one class high density
Boeing 737-400; 146 passengers typical two class or 188 passenger one class high density
Boeing 737-500; 108 passengers typical two class or 132 passenger one class high density
Boeing 737-600; 110 passengers typical two class or 132 passenger one class high density
Boeing 737-700; 126 passengers typical two class or 149 passenger one class high density
Boeing 737-800; 162 passengers typical two class or 189 passenger one class high density
Boeing 737-900; 177 passengers typical two class or 189 passenger one class high density

Engines : two Pratt & Whitney or CFM turbofans
Max speed : mach 0.82, 350 kt, 648 km/h, 403 mph
Range :
Boeing 737-100; 1540 nm, 2855 km
Boeing 737-200; 1900-2300 nm, 3520-4260 km (depending on engines & weight opt)
Boeing 737-300; 2685 nm, 4973 km
Boeing 737-400; 2160 nm, 4005 km
Boeing 737-500; 1520 nm, 2815 km
Boeing 737-600; 1340 nm, 2480 km
Boeing 737-700; 1540 nm, 2852 km
Boeing 737-800; 1990 nm, 3585 km
Boeing 737-900; 2060 nm, 3815 km
there are HGW options (high gross weight) for each type which added up to twice the range for reduced passenger capacity.
List price :
Boeing 737-600; 41 to 49+ million USD
Boeing 737-700; 47 to 55+ million USD
Boeing 737-800; 58 to 65+ million USD
Boeing 737-900; 61 to 69+ million USD

Boeing 737-200 classic cockpit

Boeing 737 next generation advanced cockpit with EFIS screens