Alaska Airlines is one of the world’s largest operators of the Boeing 737, and the carrier currently has five passenger variants of the popular narrowbody aircraft in its fleet. However, last year, Alaska Airlines retired one particular variant: the Boeing 737-900.

In this article, we will take a look at why Alaska Airlines chose to retire its Boeing 737-900s, the role the aircraft played in the carrier’s fleet, and what aircraft may replace the 737-900.

Alaska Airlines & The Boeing 737-900

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Alaska Airlines is one of the world’s largest operators of the Boeing 737, with the latest data from ch-aviation showing a total of 253 737s in the carrier’s fleet (including cargo variants). However, a notable absentee is the 737-900, whose time at the carrier came to an end in September.

Alaska Airlines took delivery of its first Boeing 737-900 in May 2001, registered as N302AS. The oneworld carrier went on to operate a total of 12 737-900s over the years. Each of these was able to accommodate up to a maximum of 178 passengers in a two-class configuration: 16 in business class and 162 in economy class (including 24 extra-legroom seats).

Retiring The Boeing 737-900

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However, just over a decade later, Alaska Airlines began to take delivery of the Boeing 737-900ER, which offered an extended range compared to its predecessor. This ultimately proved to be a much more popular aircraft, with the carrier going on to operate more than 70 of the type, and meant that the earlier 737-900s became slightly redundant in the airline’s growing fleet.

Alaska Airlines began reducing its fleet of Boeing 737-900s in 2024, cutting in half the number operated by the end of that year. The carrier’s first Boeing 737-900, registered as N302AS, was retired in April 2025, after almost 24 years of service at the carrier, with the withdrawals completed by September.

Which Aircraft Will Replace The Boeing 737-900?

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The first replacement for Alaska Airlines’ Boeing 737-900s was the 737-900ER, which first joined the carrier’s fleet in 2012. From the outside, the 737-900 and 737-900ER appear almost identical. However, the latter Boeing 737 model has the option to add an extra set of emergency exit doors towards the rear of the fuselage. These additional emergency exit doors allow the Boeing 737-900ER to have an increased passenger capacity of up to 220 passengers.

With that being said, Alaska Airlines chose to keep its passenger capacity the same as on its 737-900s: 16 in business class and 162 in economy class, albeit with 30 extra legroom seats this time. For Alaska Airlines, the main advantage of the 737-900ER over the 737-900 is, as its name would suggest (ER = extended range), its increased range of up to 3,775 miles.

Later, the Boeing 737 MAX 9 became the aircraft of choice for Alaska Airlines, with its similar passenger capacity coupled with more advanced technology and lower operating costs making it ideal for the carrier’s growing fleet of narrowbody aircraft. However, the Boeing 737 MAX 9 has not been without its problems. The 737 MAX program as a whole was halted temporarily following two fatal crashes in the aircraft’s early life.

The first of these was Lion Air flight 610, which crashed in the sea while flying between Jakarta Soekarno-Hatta International Airport (CGK) and Depati Amir Airport (DPK), killing all 189 passengers and crew members onboard. This was followed by Ethiopian Airlines flight 302, which crashed on take-off from Addis Ababa Bole International Airport (ADD), en route to Nairobi Jomo Kenyatta International Airport (NBO), killing all 157 passengers and crew members onboard.

Following this, Alaska Airlines itself hit the headlines when a door blew out on one of its Boeing 737 MAX 9s in January 2024. Luckily, nobody was killed in the incident, but it likely had a significant reputational impact for both the airline and the US aircraft manufacturer.

The Boeing 737-900 Was Never A Popular Variant

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The concept of the Boeing 737-900 was first launched in 1997, with the aircraft entering service four years later in 2001 with Alaska Airlines. However, the aircraft did not prove to be as popular with airlines compared to previous and subsequent variants of the 737, and only three carriers ever operated the type: Alaska Airlines, KLM, and Korean Air.

Today, the largest operator of the Boeing 737 is Southwest Airlines, which has a staggering 809 737s in its fleet, made up of 310 737-700s, 197 737-800s, and 302 737 MAX 8s. The low-cost carrier also has a further 194 737 MAX 8s on order, and 259 units of the smaller 737 MAX 7.

Alaska Airlines’ Remaining Fleet

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Alaska Airlines has a long history with the Boeing 737, having operated most major variants over the years. The carrier first took delivery of a 737-200 in the early 1970s, and has flown the models detailed in the table below.

Alaska Airlines’ relationship with the Boeing 737 shows no sign of stopping anytime soon. The carrier is currently awaiting delivery of a further eight 737 MAX 8s, as well as 168 examples of the larger 737 MAX 10. The Boeing 737 MAX 10 is yet to receive certification from the US Federal Aviation Administration, but Alaska Airlines expects to begin taking delivery of its first of the largest 737 MAX variant by 2027.

The Boeing 737-900ER proved to be much more popular with Alaska Airlines, with the carrier operating 79 of the aircraft. This makes the 737-900ER the second most common aircraft type in the carrier’s fleet, behind the 737 MAX 9, of which the airline operates 80.

Related

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The airline has an all-Boeing 737 fleet for its mainline operations.

Where Does Alaska Airlines Fly Its Boeing 737-900ERs?

Credit: Photo: Joe Kunzler | Simple Flying

Previous research by Simple Flying showed that, in May 2025, data from Cirium, an aviation analytics company, showed that Alaska Airlines deployed its fleet of 79 Boeing 737-900ERs on a variety of routes across the US. The carrier’s service between Seattle-Tacoma International Airport (SEA) and Phoenix Sky Harbor International Airport (PHX) topped the list, with 344 flights per month, and the most popular routes are outlined in the table below.

Alaska Airlines also makes use of the Boeing 737-900ER’s extended range, deploying the aircraft on transcontinental routes. These include those between San Francisco International Airport and New York John F. Kennedy International Airport, or Seattle-Tacoma International Airport and Miami International Airport.

Related

These Are Alaska Airlines Oldest Active Aircraft

While the airline operates a handful of aged planes, only five are headed to retirement.

Farewell To The Boeing 737-900

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In summary, the Boeing 737-900’s shorter range compared to the 737-900ER was its downfall in Alaska Airlines’ usage of the type. Given the carrier’s penchant for operating longer, cross-country routes from its West Coast hubs, including Seattle-Tacoma International Airport and San Francisco International Airport, the 737-900ER simply gives it more operational flexibility. The Boeing 737-900 also lacked the structural and design updates, such as extra exit doors, to support higher-density seating.

This made them less cost-efficient to operate compared to more modern variants of the 737, such as the 737-900ER and the 737 MAX 9. Alaska Airlines is placing its confidence in the Boeing 737 MAX, with a further eight 737 MAX 8s on order, in addition to 168 737 MAX 10s, which the carrier will begin to receive in 2027.

When it comes to widebody aircraft, Alaska Airlines recently unveiled a new look for its incoming Boeing 787-9 jets. The carrier will deploy these aircraft on a series of new routes from its hub at Seattle-Tacoma International Airport, including to London Heathrow Airport (LHR) and Reykjavik Keflavik International Airport (KEF). At the time of the announcement in 2025, Alaska Airlines’ CEO, Ben Minicucci, celebrated the news, saying that:

“With these bold moves, we are accelerating our vision to connect our guests to the world. We are seizing this moment to redefine the international experience and level up. And we’re doing it with the same relentless focus on safety, care and performance that’s always defined us. I’m so proud of how our people continue to step up and deliver as we push ahead on these initiatives, with even more to come.”