U-1A Otter US ArmyDeHavilland DHC 3 U 1A Otter Army airplane model. Although the Otter found ready acceptance in bush airlines, as in a similar scenario to the DHC 2 Beaver, the US Army soon became the largest operator of the aircraft (184 delivered with the designation U 1A Otter). Other military users included Australia, Canada and India but the primary role of the aircraft as a rugged bush plane continues to this day. The Otter is also a popular airplane among the