Boeing 737 Next Generation

The **Boeing 737 Next Generation**, often called the **737NG**, is a family of Boeing 737s. The 737-600, -700, -800 and -900 are all 737NG aircraft. It is the third family of Boeing 737. The family which came before it is the 737 Classic (−300/-400/-500)  family. They have been made since 1991 by Boeing Commercial Airplanes. All 737s are twin-engined, narrow-body airliners. This means that they all have two engines and only have one aisle between seats.

4,293 737NG aircraft have been delivered (as of December 2012). More than 6,300 have been ordered by airlines. Southwest Airlines has more 737NGs than any other airline. Ryanair, a low-cost airline from Ireland, also has a lot of 737NGs. The only planes Ryanair has are 737-800s. The main rival of the 737NG family is the Airbus A320 family. The Boeing 737 MAX will eventually replace the 737NG.

## Design and development 
### Background 
After Airbus launched the Airbus A320, Boeing started designing a new series of Boeing 737. The *737 Next Generation* (NG) program was announced on November 17, 1991. Boeing made many changes from the 737 Classic, like the wings. These changes made its area bigger by 25 percent. The wingspan was 16&nbsp;ft (4.88&nbsp;m) bigger than the Classic. These changes also meant that it could carry 30% more fuel. CFM56-7B engines were used, allowing the 737NG to fly 900&nbsp;nautical miles (about 1036 miles) farther.

### Further developments 
In July 2008, Boeing brought new brakes for 737NGs. They were supposed to replace the steel brakes originally added. They made the brakes  lighter. The  lost by the new installation on the Boeing 737-800 meant that 0.5% less fuel will be burned while in the air. Delta Air Lines got the first new 737NG with these brakes. That plane was a 737-700.

On August 21, 2006, Sky News had said that some 737NGs had faulty parts. The report said that Boeing had found some parts of the plane to be faulty, but they had decided not fix it. Boeing said that these statements were "without merit".  However, another show looked at 737NGs and also thought that some things were faulty.

## Replacement 
Since 2006, Boeing was thinking about replacing the 737 with a very different and new design.

On July 20, 2011, Boeing announced that it would make a new version of the 737. The new variation would have 2 CFM International LEAP-X engine. American Airlines said it would order 100 of these planes. The new version was finished in 2016.

On August 30, 2011, Boeing said it would definitely make this new plane. They called it the Boeing 737 MAX. The CFM International LEAP-1B engines that it uses burns 16% less fuel than the Airbus A320neo family.  The Boeing 737 MAX's main rival is the Airbus A320neo family.

## Variants
### 737-600
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The 737-600 replaced the 737-500. Its main rival is the Airbus A318. 69 737-600s have been made. Its main rival is the Airbus A319. Southwest Airlines currently has the most 737-700s. They have more than 400 of them.

The *737-700C* is a version where the seats can be taken out to carry cargo instead. There is a big door on the left of the aircraft. The United States Navy got the first 737-700C. The Navy planes are called the C-40 Clipper.

#### 737-700ER
The *737-700ER* ("ER" means "extended range") came out on January 31, 2006. It can fly for . The 737-700ER's main rival is the Airbus A319LR.

### 737-800
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The 737-800 is a longer version of the 737-700. It replaces the 737-400. For many airlines in the United States, the 737-800 replaced Boeing 727-200s.

The 737-800 is one of the planes which replaces the McDonnell Douglas MD-80. It burns  of fuel every hour. That is about 80% less fuel than an MD-80.

On August 14, 2008, American Airlines said it was ordering 26 737-800s. 2,135 737-800s have been delivered.

## Users
As of July 2010, 3,119 Boeing 737 Next Generation planes are being used by airlines.  There are 62 -600s, 1,019 -700s, 1,915 -800s and 123 -900s.

## Orders and deliveries
*Data through December 31, 2012. Updated on January 7, 2013.* A hull-loss accident is an accident where the plane is damaged so much it cannot be repaired, or if it is completely destroyed.The most notable accidents are shown here.
* While landing at Chicago Midway International Airport on December 8, 2005, Southwest Airlines Flight 1248, a B737-7H4, was not able to stop before the end of the runway.It then crashed onto. some cars on a street, killing a six-year-old boy. People on board the plane had injuries that were not serious. The plane later became a N286WN after repairs.
* On September 29, 2006, Gol Transportes Aéreos Flight 1907, a 737-8EH, crashed into a Embraer Legacy 600 over Mato Grosso.The 737 crashed into a rainforest, while the Legacy was able to make an emergency landing.154 died in the accident(everyone on the 737)and 7 survived(everyone on the Legacy).
* Kenya Airways Flight 507 crashed shortly after takeoff from Douala Airport, Cameroon into a swamp on 5th May 2007 at night.The pilots did not know that the plane was turning to the right by itself, and after the captain turned the plane further, the plane started to descend and the crash followed. All 114 onboard are killed.
* China Airlines Flight 120 caught fire and exploded after landing at Naha Airport on 20th Aug 2007.There was a fuel leak on the right wing as it was damaged when the flaps were retracted after landing.Fuel flowed to high-temperature areas near the right engine,causing a fire. All 165 survived the accident as they left the plane before the fire spread into the passenger cabin.

* Due to birdstrike, the nose, wings and engines of Ryanair flight 4102 were damaged while the plane was landing at Rome Ciampino Airport on November 10, 2008. The plane stopped on the runway with the left main landing gear collapsed. Although none of the 172 onboard were injured, the plane was written off.
* Turkish Airlines Flight 1951 crashed while landing at Amsterdam Schiphol Airport on February 25, 2009. Investigators later discovered that one of the altimeters, which show how high the plane is flying, was wrong. This led the autopilot to switch the engines to "idle", and the engines only produced a small amount of thrust. As the plane flew on, it eventually stalled, and started descending. The pilots did not realise this until the warning started, and did not control the plane properly to recover from the stall, causing the crash. 9 people were killed.

* Just after takeoff from Beirut International Airport in Lebanon on January 25, 2010, Ethiopian Airlines Flight 409 crashed into the sea, killing all 90. While the Lebanese investigators blamed the pilots for not controlling the plane properly causing a loss of control, Ethiopian Airlines thought that the Lebanese were incorrect, saying that the plane could have been struck by lightning, or even shot down by a missile.
* Air India Express Flight 812, a Boeing 737-8HG, was not able to stop before the end of the runway while landing at Mangalore Airport in India on May 22, 2010. The plane continued out of the airport and fell into a gorge, killing 158 people. The accident was determined to caused by pilot error. This is the worst ever crash of a Boeing 737 aircraft.

## Details
Sources: Boeing 737 Specifications, 737 Airport Planning Report

## Related pages
## References
### Notes
### Bibliography
* Endres, Günter. *The Illustrated Directory of Modern Commercial Aircraft*. St. Paul, Minnesota: MBI Publishing Company, 2001. . 
* Norris, Guy and Mark Wagner. *Modern Boeing Jetliners*. Minneapolis, Minnesota: Zenith Imprint, 1999. . 
* Shaw, Robbie. Boeing 737–300 to 800. St. Paul, Minnesota: MBI Publishing Company, 1999. .

## Other websites
*737 page on Boeing.com
*Boeing 737-600/700/800/900 on Aerospace-Technology.com
*Boeing 737NG on Smartcockpit.com