How does the air-flow rate on current jetliners compare to earlier models?
Each Boeing airplane model, from the earliest to the latest, have been designed to deliver approximately the same total ventilation rate per passenger. The principal difference is that on newer versions, the cabin air is a mixture of about 50 percent outside air and 50 percent filtered/recirculated air. Among the benefits of this design is a lower potential exposure to atmospheric ozone and reduced fuel burn and associated engine emissions.
