Editing Environmental control system (section)

== Overview ==
The systems described below are specific to current production [[Boeing Commercial Airplanes|Boeing]] airliners, although the details are essentially identical for passenger jets from [[Airbus]] and other companies. An exception was [[Concorde]] which had a supplementary air supply system fitted due to the higher altitudes at which it flew, and also the slightly higher cabin pressure it employed.<ref>{{cite book |title=Nunn's Applied Respiratory Physiology |first=John Francis |last=Nunn |location=Burlington, Maryland |publisher=Butterworth-Heineman |year=1993 |isbn=978-0-7506-1336-1 |url-access=registration |url=https://archive.org/details/nunnsappliedresp0004nunn|page=341}}</ref>