![]() The plugged door probably has pins located in the top and bottom that secure the door in place, while the activated door version probably uses the overhead hinges, similar to current over wing exits. ![]() If a 189 seat operator decides to offload a few of these birds to a high density LCC, is there a big expense in reactivating the door? My guess is, the interior wall panel would have to be replaced. They can have exit doors installed later should the airline or future operator decide to activate the doors. Without the need to fly more than 189 passengers, the doors may as well be plugged to save weight and avoid an unnecessary exit row. In addition to Lion Air, other airlines with active additional exit doors are SpiceJet, Thai Lion Air, and Ukraine International Airlines, among a handful others. That's why the additional doors aft of the wings were added to the -ER series, along with the addition of a flat rear pressure bulkhead and increased payload capability it raised the passenger count for LCCs to fill the aircraft to the brim and made it competitive with the A321. All B737-900s that are in service have the same exit configuration as the 737-800, which made the stretch somewhat meaningless for LCCs (already operating B738s at the max count of 189) and unable to compete with the A321. Just to add to what everyone else said - the additional exits are ONLY available on the B737-900ER aircraft.
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