Athens airport taxi is always yellow color. There is taxi station just outside of the arrival area but there is case to have to wait for the first available taxi because local taxis are on moving all time. You have to take the first one taxi from the row, so you can not choose what car you want. Remember that you must have always cash with you because many local taxi drivers don’t have POS. To avoid any inconvenience and enjoy your arrival at Athens make a booking for your airport transfer in advance.