"The flight's cockpit crew has been taken off scheduled duties pending investigation", the airline added.
On Thursday, passengers were able to wear oxygen masks before the oxygen levels in the body could drop too low. "First aid was administered to a few guests who complained of ear pain, bleeding nose, etc", the statement said.
Cabin pressure is maintained by a flight's crew to ensure comfort for everyone aboard.
This fact initiated the investigation, at the end of which it was made a decision to keep the crew from working.
"Jet Airways B737 aircraft operating flight 9W 697 of 20th Sep 2018 [Mumbai-Jaipur] had air turnback to Mumbai".
A Jet Airways official said, "All guests were deplaned safely and taken to the terminal". When air pressure is lower, there is less oxygen available, and the air becomes thinner and drier, which can cause bleeding from the ears and nose.
In a mid-air scare, a Jaipur-bound Jet Airways flight had lost cabin pressure after the crew "forgot" to turn on a control switch leaving 30 passengers bleeding from ears and nose and forcing the aircraft to return to Mumbai.
Pictures of bleeding passengers have caught ire on social media. The doctors advised a week rest for all the passengers.
Lalit Gupta, deputy director general of the Directorate General of Civil Aviation (DGCA), confirmed the incident was due to pilots accidentally neglecting to regulate the cabin pressure, according to the Hindustan Times.
On August 25, a Jet Airways Boeing 777 flight which was taxiing for take off for London from Delhi reportedly came to a sudden halt as the pilot did not have the ATC clearance.
The unbundle plan covers the "Economy Light" and "Economy Deal" categories in the domestic sector, the airline said, adding, however, flyers will continue to get free beverages, including tea and coffee.
The directive comes days after an Indian airline flight from New Delhi to NY experienced multiple system failure while struggling to land at John F Kennedy Airport in NY.