A Frontier Airlines flight reportedly declared a medical emergency Thursday after four flight attendants became sick with headaches and nausea shortly before landing in Florida.

Frontier Flight 1046 was traveling from Cleveland to Fort Lauderdale-Hollywood International Airport when the pilots requested that emergency medical personnel meet the Airbus A321 at the gate, according to air traffic control communications reported by PYOK.

The aircraft landed at Fort Lauderdale-Hollywood International Airport without incident, where emergency responders were waiting, according to the outlet.

As the aircraft approached South Florida, one of the pilots alerted air traffic controllers to a “developing medical” situation on board.

“If you could call the tower and have them meet at our gate for a developing medical,” the pilot said in the radio call.

When asked about the nature of the medical emergency, the pilot said multiple flight attendants were experiencing symptoms.

“All my flight attendants have headaches, and now three, now four, are nauseous,” the pilot said.

The aircraft, a 10-year-old Airbus A321, departed Cleveland shortly before 8 a.m. on Thursday. It was scheduled to return to Cleveland at 11:30 a.m., but that flight was canceled, according to PYOK.

The cause of the flight attendants’ illnesses was not immediately known, and their conditions after landing were unclear.

FOX Business has reached out to Frontier Airlines for comment.