Established in 2003, Muscat Duty Free (MDF) (a trade name of Oman Sales & Services LLC) is a 50/50 joint venture company between Oman Air and Aer Rianta International Middle East (ARIME), an arm of the renowned Aer Rianta, which is widely credited with pioneering the concept of airport duty free shopping. ARIME is the biggest international duty free operator in the Middle East region, with business interests in Bahrain, Lebanon, Cyprus, Qatar, Egypt and Oman.