波音307型平流层客机是第一架拥有客舱增压系统的商用运输机。这一特性使其有能力在20,000英尺（6000米）高空进行巡航，使其能避开许多天气干扰。压力差为2.5 psi (17 kPa)，所以飞机飞行在14,700 ft (4,480 m)高度时，机舱内压力为8,000 ft (2,440 m)高度的压力。307型可携带5个机组成员及33名旅客。机舱最大宽度为 12 ft (3.6 m)。它是第一架在机组成员里包括飞行机械师的陸基飛機（部分船型水上飛機在早些時候已經在機組成員中增加飛行機械師了）。[1]
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