The news comes after Air France resumes flights to Iran after an eight year break. It's been said that many of the female Air France cabin crew are resistant to the ruling, which asks them to wear pants and a loose fitting jacket on the flight and don a headscarf when outside the plane in Tehran.

Union officials say a number of female staff are unhappy with the ruling, although Air France argue that the headscarf edict is "not new" and fits in with Iranian law and should therefore be respected. Union representatives believe that these flights shouldn't be compulsory and that flight attendants should be given the right to refuse them. 

Air France flights to Iran were suspended in 2008 when Iran’s nuclear policy was implemented.

Air France hostesses upset over wearing headscarves on Tehran flights