KARACHI, April 6: Citibank and Airblue Limited have signed a memorandum of understanding under which Citibank Clear Card members would get discounts and air miles on purchase of Airblue tickets. These will be in addition to the discounts the airline offers to all customers from time to time. The MoU was signed by Ahmed Khizer Khan of Citibank and Shahid Khaqan Abbasi of Airblue, says a press release.