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Passengers can determine that the aircraft's oxygen is low.
Airline pilots get ten times more oxygen than economy passengers get, says a report mandated by the US Congress from the National Academy of Sciences. Scientists have also proven that poor air quality results in lack of oxygen to the brain and impaired visual acuity. As a matter of fact, some airlines required their pilots to sip pure oxygen prior to landing so that they are as alert as possible for this crucial phase of the flight. Newer jets, as compared to older models, have been designed with less fresh air capacity for passengers. This is a regrettable circumstance of modern aviation that can only be changed by retro-fitting the newer planes at their factories.