The reason that brought a privately-ownedUS plane this week to Mehrabad international airport in Tehran, the first US commercial jet to land there in 35 year, is unknown, especially when the Washington has not yet agreed formally to do business with Iran. The New York Times reports that the aircraft is owned by the Bank of Utah, is based in Accra, Ghana, and was recently spotted at Zurich when the city hosted the annual World Economic Forum. It is operated by Engineers & Planners Company Ltd. of which Adi Ayitevie is listed as executive director.