In which country did Frank Whittle continue aerospace work with Hazel?

Answer

United States

Following the conclusion of World War II, Frank Whittle spent time in the United States, where he contributed further to the field of aerospace engineering. His second wife, Hazel S. Hall, is linked to this later phase of his life, which was characterized by continued professional contributions and a shift away from the initial, intense period of developmental struggle in Britain.

In which country did Frank Whittle continue aerospace work with Hazel?
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