The airline's uniform code states that staff must not wear visible jewellery or other 'adornments' while on duty without permission from management.
It makes exceptions for Muslim and Sikh minorities by allowing them to wear hijabs and turbans.
Under rules drawn up by BA's 'diversity team' and 'uniform committee', Sikh employees can even wear the traditional iron bangle - even though this would usually be classed as jewellery - while Muslim workers are also allowed prayer breaks during work time.
But Miss Eweida, 55, from Twickenham, insisted her cross, which is smaller than a ten pence piece, was not jewellery but an expression of her deep Christian faith.
She questioned why she was being forced to hide her religion when BA's Muslim and Sikh workers could express theirs.
Miss Eweida said last night: "I will not hide my belief in the Lord Jesus. British Airways permits Muslims to wear a headscarf, Sikhs to wear a turban and other faiths religious apparel.
"Only Christians are forbidden to express their faith. I am a loyal and conscientious employee of British Airways, but I stand up for the rights of all citizens."
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