Alexis Felix du Pont Sr. (1879–1948) was a member of the American du Pont family and helped found St. Andrew's School in Middletown, Delaware. His son, Alexis Felix du Pont, Jr., co-founded the All American Aviation Company, predecessor of today's US Airways Group, Inc, whose primary subsidiary is US Airways, the fifth largest airline in the United States. The Du Pont family is an American family descended from Pierre Samuel du Pont de Nemours (1739-1817). The son of a Paris watchmaker and a member of a Burgundian noble family, he and his sons, Victor Marie du Pont and Eleuthère Irénée du Pont, emigrated to the United States in 1800 and used the resources of their Huguenot heritage to found one of the most prominent of American families, and one of its most successful corporations, E. I. du Pont de Nemours and Company, initially established by Eleuthère Irénée as a gunpowder manufacturer. Various members of the family managed the company well into the twentieth century and to this day constitute a substantial portion of the company's ownership.