Designed and built by Herbert Dean of Flint , Michigan , the aircraft was destroyed on its first flight and Dean was killed .
The Dean Delt - Air 250 was an American twin - seat amateur - built , delta wing light aircraft .
Designed and built by Herbert Dean of Flint , Michigan , the aircraft was destroyed on its first flight and Dean Delt - Air 250 was killed .
The Dean Delt - Air 250 was an American twin - seat amateur - built , delta wing light aircraft .