Boeing 737-900ER

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B739  Boeing · Boeing 737 Next Generation

Boeing 737-900ER at a glance

  • What it is: the Boeing 737-900ER is a medium-range jet built by Boeing, first flown in 2006.
  • On the radar: it shows up as type code B739. How to spot it overhead.
  • How far it flies: about 5,460 km without stopping, cruising near 842 km/h.
  • How many it carries: 178–220 passengers, depending on how the airline fits out the cabin.
  • Power: 2× CFM56-7B, with a 35.8 m wingspan.
5,460 km
Range
842 km/h
Cruise speed
178–220+
Passengers
2006
First flight

The longest 737NG, stretched to compete with the Airbus A321. Extra exit doors and a flat rear pressure bulkhead allow up to 220 seats. United, Delta, Alaska and Lion Air are its largest operators.

The story of the Boeing 737-900ER

Boeing launched the 737-900 in 1997 with an order from Alaska Airlines. It was the largest Next Generation 737 and was meant to counter the Airbus A321. Boeing simply added another fuselage plug to the -800. It first flew on August 3, 2000, and Alaska began service in 2001. On paper it finally matched the A321 for seats. Boeing expected the orders to follow easily.

In practice the first version sold poorly, because its exit layout capped seating at 189. Boeing answered with the 737-900ER, launched in 2005 for Lion Air. That model added an extra pair of exit doors, a flat rear pressure bulkhead, optional extra fuel tanks, and strengthened wings and landing gear. Lion Air needed every single seat it could get. Those changes completely transformed the sales pitch.

The -900ER flew on September 1, 2006 and entered service with Lion Air in April 2007. Maximum seating rose to 220 and range became strong again. Around 500 of the ER model were built before production wound down in favor of the MAX 9. United, Delta and Alaska still lean on it for dense domestic routes, where low trip costs pay off. Many airframes are still relatively young.

Design and engineering

Two CFM56-7B turbofans power the 737-900ER. Its Next Generation wing is wider and longer than the 737 Classic wing and holds more fuel.

Range grew further with optional auxiliary tanks. Most examples carry blended winglets, which trim fuel burn on longer sectors. Six flat-panel displays fill the flight deck.

That flight deck shares one type rating with every other 737, from the -600 through the MAX, which is central to the family's appeal. The cabin uses the familiar single-aisle 3-3 layout, and later jets have the Boeing Sky Interior.

How to recognise the B739 in the wild

The longest 737NG fuselage looks noticeably stretched and slightly pencil-like, with two overwing exits per side plus an extra exit door pair behind the wing on the ER; look for blended winglets and the 737's distinctive flat-bottomed, non-circular engine inlets. More tells in how to identify any aircraft overhead.

Variants and close relatives

VariantWhat sets it apart
737-900The original 2001 version without the extra exits, limited to 189 seats and built in small numbers.
737-900ERThe 2007 extended-range version with extra exit doors and auxiliary fuel tanks, seating up to 220.
BBJ3The Boeing Business Jet derivative of the 737-900ER for corporate and government customers.
737 MAX 9The re-engined successor with CFM LEAP-1B engines that replaced the -900ER in production.

Major operators: United Airlines, Delta Air Lines, Alaska Airlines, Lion Air, Korean Air - Find them in the airline database and watch their B739s on the live map.

Facts about the Boeing 737-900ER

  • The 737-900ER's rear pressure bulkhead was flattened rather than domed, a change that freed enough cabin length for two extra seat rows.
  • At 42.1 meters, the 737-900 is longer than the original 707-120 that started Boeing's jet age.
  • Alaska Airlines was the launch customer for the original -900 and Lion Air of Indonesia launched the -900ER.
  • Despite seating up to 220 people, the -900ER is flown by crews holding the same type rating as the 108-seat 737-600.
ICAO type code
B739
Manufacturer
Boeing
Capacity
178–220 passengers
Range
5,460 km
Cruise speed
842 km/h
MTOW
85,130 kg
Engines
2× CFM56-7B
Wingspan / length
35.8 m / 42.1 m

Aircraft related to the Boeing 737-900ER

Comparable types selected by family, manufacturer, capacity, range and generation.

B738 Boeing 737-800 Boeing · 162–189 passengers B737 Boeing 737-700 Boeing · 126–149 passengers B38M Boeing 737 MAX 8 Boeing · 162–210 passengers B752 Boeing 757-200 Boeing · 180–239 passengers

Tracked flights using the Boeing 737-900ER

These existing flight profiles list the Boeing 737-900ER as typical equipment. Airlines can substitute another type on the day.

FlightRoute
AS1SEA → ANCTrack AS1 →
AS11JFK → LAXTrack AS11 →
AS830SEA → HNLTrack AS830 →

More aircraft and tracking guides for the Boeing 737-900ER

Spot one overhead using our aircraft identification guide. Telling this maker apart from its rival is easier than it looks, as Boeing versus Airbus shows. Short-haul flying has its own economics, covered in low-cost versus full-service.

Data sources and review

Reviewed 2026-07-29 by Flight-Tracker.net Editorial Team

Range, seating, speed and weight describe the aircraft type, not a specific airline configuration. Published figures vary by engine, weight option and cabin layout.

Read our aircraft specification sourcing and review process, or inspect the machine-readable reference dataset.

Boeing 737-900ER frequently asked questions

What is the range of the Boeing 737-900ER?

The Boeing 737-900ER has a published range of about 5,460 km, cruising at roughly 842 km/h. Real-world range depends on payload, winds and reserves.

How many passengers does the Boeing 737-900ER carry?

A typical Boeing 737-900ER seats 178–220 passengers, though the exact number depends on how the operating airline configures its cabin.

What is the ICAO type code for the Boeing 737-900ER?

The Boeing 737-900ER uses the ICAO type designator B739. That is the code you will see when you click this aircraft type on a live flight-tracking map.

What engines does the Boeing 737-900ER use?

The Boeing 737-900ER is powered by 2× CFM56-7B, with a maximum takeoff weight of about 85,130 kg and a wingspan of 35.8 m.

How do you identify a Boeing 737-900ER?

The longest 737NG fuselage looks noticeably stretched and slightly pencil-like, with two overwing exits per side plus an extra exit door pair behind the wing on the ER; look for blended winglets and the 737's distinctive flat-bottomed, non-circular engine inlets.

Which airlines operate the Boeing 737-900ER?

Major operators in this reference profile include United Airlines, Delta Air Lines, Alaska Airlines, Lion Air, Korean Air. Fleets change as aircraft are delivered, stored, leased and retired, so confirm current fleets with the airline.

Which tracked flights use the Boeing 737-900ER?

Selected scheduled services in this tracker that typically use the Boeing 737-900ER include AS1, AS11, AS830. Equipment can change on the day, so the aircraft shown for each flight is a typical assignment, not a guarantee.

Is the Boeing 737-900ER a narrowbody or a widebody?

The Boeing 737-900ER is a narrowbody, meaning a single aisle down the middle of the cabin. With 178–220 passengers seats and 5,460 km of range it is typically flown on short and medium-haul routes.