Some Delta Air Lines passengers are recovering after a pressurization issue on a flight from Salt Lake City to Portland caused bloody noses and other issues, according to airline and passenger statements.

Authorities are investigating a flight that turned around after the aircraft did not properly pressurize. Passengers bled from the ear and nose, local media said.

Flying can be stressful, especially when things go wrong mid-flight, like on a recent Delta flight where pressurization issues caused injuries. Keep scrolling to learn about how proper pressurization is key to flight safety,

"The crew of Delta Air Lines Flight 1203, a Boeing 737-900, returned to Salt Lake City International Airport after reporting a possible pressurization issue," the FAA said.

On Sept. 15, a distressing incident occurred aboard Delta Air Lines Flight 1203 shortly after takeoff from Salt Lake City International Airport. The Boeing