Should be able to use. You apply discount code when getting the flight quotes. Then you apply WJD at checkout, when you are signed in, it will tell you what you have available and can use towards the flight, keep in mind the taxes and fees must then be covered either via credit card or via your travel bank (if you use your travel bank, you will have to call an agent to manually process that). WJD only covers base fare, travel bank can cover taxes and fees as well as fare.