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The post said the female workers were forced to climb into the compartments by male security staff as part of an "industry ritual" after completing their first 30 to 50 hours of work.
Kunming Airlines said the pictures were taken after the crew's duties had been completed and there were no safety risks to the flights.
"The company attaches high importance to this incident and will prevent such things from happening again," the statement said.
Chinese state broadcaster CCTV said some of the flight attendants reported feeling bullied into complying with the "ritual" out of fear of being seen as uncooperative by senior colleagues.