There seems to be varying info on this... The BBC article claims it wasn't "installed" for AS, but this article: https://www.flightglobal.com/the-737-story-the-

There seems to be varying info on this... The BBC article claims it wasn't "installed" for AS, but this article: https://www.flightglobal.com/the-737-story-the-long-stretch/65315.article https://www.flightglobal.com/the-737-story-the-long-stretch/... "Provision for the new exits – which boost the exit limit capacity from 189 to 215 passengers – “will be structurally installed as standard in all -900s, and will allow operators to decide if the door should be activated or deactivated”, says 737 chief project engineer Mike Delaney." Makes it sound like they're always installed, and airlines can opt to activate them or not...