The Federal Aviation Administration (FAA) is conducting an investigation after ten passengers from a Delta Air Lines flight heading to Oregon needed medical assistance following an emergency landing.

The crew of Flight 1203, which was en route to Portland International Airport, made a return to Salt Lake City International Airport after reporting a possible issue with cabin pressurization on Sunday morning, according to information provided to YSL News by the FAA on Tuesday.

The Boeing 737-900 that was carrying 140 passengers landed around 8:30 a.m.

A spokesperson for Delta reported that emergency first responders were waiting at the gate and found 10 individuals who required further evaluation or treatment.

However, the airline did not specify what kind of evaluation or treatment these passengers received.

Airline will cover passenger transport costs for hospital visits

The airline stated they would pay for transportation to medical facilities for affected passengers, but did not provide further details.

The Salt Lake City Fire Department, who responded at the scene, informed CBS News that no individuals were transported to a hospital.

Delta aircraft back in operation following emergency landing

Delta confirmed that the airplane was taken out of service early that morning but was returned to service on Monday after technicians fixed the pressurization problem.

In a statement, Delta expressed: “We truly apologize for our customers’ experience on flight 1203 on September 15. The flight crew adhered to protocol in returning to SLC, where our ground teams attended to our customers’ immediate needs.”

The FAA has announced an investigation into the incident.

Natalie Neysa Alund is a senior reporter for YSL News. You can  follow her on X @nataliealund.