A Christian airline clerk went to London's High Court on Tuesday in a bid to force British Airways to admit to religious discrimination back in 2006.
58-year-old Nadia Eweida is asking for money in lost wages after the airline demanded she stop wearing a cross at work.
The airline sent her home for refusing to comply with rules banning employees from wearing religious symbols.
British Airways eventually changed its policy and allowed Eweida to return to work several months later.
The airline argues that it did not discriminate against Eweida, because she has been allowed to wear her cross at work now for the past three years.
A decision is expected from the High Court in the coming weeks.