Last week, four flight attendants from American Airlines sustained injuries due to turbulence, according to the airline.

American Airlines flight 2905 took off from Tampa at 5:39 p.m. Thursday, bound for Charlotte, when the Airbus A321 hit “unexpected turbulence,” as reported by an American Airlines representative to YSL News.

Four of the six flight attendants on board were taken to a nearby hospital for further assessment. Details regarding their injuries have not been made public.

All 154 passengers onboard remained uninjured during the turbulence, and the aircraft landed safely and on schedule.

“We appreciate our crew members for their professionalism and our customers for their patience,” the airline stated.

This occurrence adds to a growing list of turbulence incidents that are becoming increasingly more frequent, even during summer months. According to researchers, climate change could lead to an increase in both the frequency and intensity of turbulence, especially clear air turbulence, which is challenging for pilots to predict due to the lack of visible indicators. In May, a Singapore Airlines flight faced severe turbulence, injuring 30 passengers and resulting in one fatality due to a heart attack.

Earlier in the month, Korean Air announced it would cease serving instant ramen onboard as a safety measure due to worsening turbulence conditions.