On Thursday, an alleged oversight by the cockpit crew of a Jet Airways flight left around 30 passengers bleeding from their nose and ears. It happened because of “loss in cabin pressure”, according to a Jet Airways statement, which was probably triggered by the fact that the pilots forgot to turn on the ‘bleed-air’ switch to maintain cabin pressure.

We give you a lowdown of how cabin pressure is regulated in an aircraft and what happens in case of a blunder, like the one that allegedly took place on the Mumbai-Jaipur Jet Airways flight.