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.

The FAA is launching an investigation into a Delta Airlines flight that was diverted back to Salt Lake City on Sunday.

Passengers onboard a Delta Air Lines flight from Salt Lake City, Utah to Portland, Oregon experienced bleeding eardrums, noses and headaches due to cabin pressure issues. The Federal Aviation Administration (FAA) is currently investigating the flight,