Boeing 737-900ER

What is the Boeing 737-900ER?

The Boeing 737-900ER is the final and largest variant of the 737 Next Generation family. Boeing launched it in July 2005 as the 737-900X, and it first flew in September 2006.

Lion Air took the first delivery on April 27, 2007. In all, 505 were delivered.

The full specification table for the aircraft is on this page, so this article explains the numbers instead of repeating them.

737-900 vs 737-900ER: what changed?

The original 737-900 flew on August 3, 2000, and Alaska Airlines received the first one in May 2001. Boeing built only 52 of them.

It was a 737-800 stretch that kept the same exit layout, which capped seating at 189 passengers. That limit is the main reason it never sold well.

The 900ER fixed this with an additional pair of exit doors and a flat rear pressure bulkhead. Together they raised the certified maximum seating well above the old cap.

Airlines that fly fewer seats can plug the extra doors. Boeing also offered up to two auxiliary fuel tanks in the cargo hold and fitted winglets as standard.

Explaining the numbers

The seat counts in the panel are three example cabin layouts, not three classes on one aircraft. A real airline fits one layout, and that varies widely by carrier.

Airline pages sometimes quote different wingspans because of how winglets are counted, so compare against the panel here rather than a carrier fact sheet.

Who flies the 737-900ER?

Delta Air Lines operates the 737-900ER, and Alaska Airlines and United Airlines fly 737-900 family aircraft. Lion Air was the launch customer.

The type suits dense domestic routes where an airline wants more seats than a 737-800 without moving to a wide-body.

Is it the same as the 737 MAX?

No. The 737-900ER belongs to the Next Generation family, which came before the 737 MAX. The MAX is a later generation with new engines and a different design lineage.

Boeing stopped assembling passenger 737NGs in 2019, with the last deliveries in January 2020, as the MAX took over.

Frequently Asked Questions

Is the Boeing 737-900ER the same as the Max?

No. It is a Next Generation 737, built before the 737 MAX. Boeing ended passenger 737NG assembly in 2019 as the MAX replaced it.

Is the Boeing 737-900ER a good plane?

It sold 505 times, far more than the 52 plain 737-900s, so airlines clearly valued the extra seats and exits. Passengers on a full domestic flight usually notice the layout more than the aircraft type.

What is the difference between 737-900 and 900ER?

The 900ER adds a pair of exit doors, a flat rear pressure bulkhead and optional auxiliary fuel tanks. Those changes raised the seating limit above the 189 seats of the plain 737-900.

Why is 737-900 not popular?

Its exit layout matched the 737-800, which capped seating at 189. That left it little larger in practice than the aircraft it was stretched from, and Boeing replaced it with the 900ER.