Sonex, Ltd. is an American aircraft kit manufacturer located in Oshkosh, Wisconsin, producing kits for three all-metal homebuilt monoplanes. The original aircraft design was the Sonex, a low-wing design seating two and offering fast build time, inexpensive operating costs, and moderate performance. The Waiex is almost identical, but features a butterfly tail. Xenos is a motor-glider development of the Waiex with longer wings and a lower-performance engine.

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