I heard that the manufacturers of modern airliners (Boeing, Airbus) have found a way to save fuel by reducing the conditioned bleed airflow to the cabin during certain phases of flight. Apparently, this has already been implemented on most or all new aircraft since the mid nineties.
It would seem that such a method would have a negative, and perhaps detrimental effect on air quality and should be taken seriously at a time when there is global concern about passenger in-flight contamination (triggered by SARS).
Can anyone confirm that the above procedure is indeed applied, what fuel savings are being achieved and what is your opinion on the possible effects on contamination.
Thanks in advance,