Narrowbody airliners · Boeing
Boeing 737 MAX 9 B39M
The Boeing 737 MAX 9 is the stretched version of the 737 MAX, replacing the 737-900ER and seating about 178 to 220 passengers. It pairs a 900ER-length body with LEAP-1B engines and split-tip winglets. United and Alaska are its biggest US operators.
737 MAX 9s airborne over the US now
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of all airborne aircraftplus — on the ground
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737 MAX 9s in the air over the last 24 hours
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Specifications
- ICAO code
- B39M
- First flight
- 2017
- Typical cruise
- 453 kt / 521 mph
- Service ceiling
- 41,000 ft
- Range
- 3,300 nm / 3,798 mi
- Capacity
- 178-220 seats
- Length
- 42.2 m / 138 ft
- Wingspan
- 35.9 m / 118 ft
Engines: 2 x CFM LEAP-1B turbofans. Family: 737 MAX. Figures are typical published values, rounded; real performance depends on variant, weight and conditions.
What it does in US skies
United and Alaska use the MAX 9 on busy domestic routes, Hawaii flights and Latin American services. It is less common than the MAX 8 but frequent around Seattle, Chicago, Houston, Denver and Newark.
Main US operators: United Airlines, Alaska Airlines.
How to recognize a 737 MAX 9
- Long 737 body with split-tip winglets and a blunt tail cone.
- Most US examples have a deactivated mid-cabin exit plug aft of the wing.
- Big round LEAP-1B nacelles with chevrons.
- Looks like a 737-900ER with MAX features.
How it looks on a flight tracker
Cruises at FL330 to FL390 at 420 to 520 kt. Look for UAL and ASA callsigns.
History
The MAX 9 entered service with Lion Air's Thai Lion Air in 2018. In January 2024 a door plug blew out on an Alaska Airlines MAX 9, briefly grounding the US fleet for inspections.
Where 737 MAX 9s are right now
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What is the ICAO code for the Boeing 737 MAX 9?
The ICAO aircraft type designator for the Boeing 737 MAX 9 is B39M. Flight trackers and flight plans use this four-character code.
How fast does the 737 MAX 9 fly?
The Boeing 737 MAX 9 typically cruises at about 453 knots true airspeed (about 521 mph). Ground speed on a tracker varies with the wind.
How high can the 737 MAX 9 fly?
Its service ceiling is about 41,000 ft.