From the start, Kenmore Air's seaplane maintenance and restoration service was an important part of the company. In the late-1940s, Kenmore Air became a Republic Seabee dealer for the Northwest and this became a success for Kenmore Air. At one point, 40 Seabees were based at Kenmore Air Harbor, though Kenmore Air themselves owned just one of these amphibian aircraft. Kenmore became experts in maintenance and repair of the aircraft and developed several modifications to improve the aircraft's performance. Kenmore Air also became an official aircraft and parts dealer for Cessna by the end of the 1950s, further expanding its aircraft maintenance business.