Editing Boeing B-29 Superfortress (section)

===Pressurization===

The crew would enjoy, for the first time in a bomber, full-pressurization comfort. This first-ever cabin pressure system for an Allied production bomber was developed for the B-29 by [[Garrett AiResearch]].{{efn|Boeing had previously built the [[Boeing 307 Stratoliner|307 Stratoliner]], which was the first commercial airliner with a fully pressurized cabin. Only 10 of these aircraft were built. While other aircraft such as the [[Junkers Ju 86|Ju 86P]] were pressurized, the B-29 was designed from the outset with a pressurized system.{{cn|date=August 2023}} }} Both the forward and rear crew compartments were to be pressurized, but the designers had to decide whether to have bomb bays that were not pressurized or a fully pressurized [[fuselage]] that would have to be de-pressurized prior to opening the bomb bay doors. The solution was to have bomb bays that were not pressurized and a long tunnel joining the forward and rear crew compartments. Crews could use the tunnel if necessary to crawl from one pressurized compartment to the other.<ref>Mann 2009, p. 103.</ref>