This Dornier 228-200 is the first of two aeroplanes comprising the fleet of Druk-air, the new national air carrier of Bhutan (see story beginning on page 11). Operation began last February on a three-times-a-week basis between Bhutan's capital city, Thimbu, and Calcutta in India. So successful has the 90-minute flight been that frequency has been raised to a daily operation since mid-March.