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planned to go into aviation in a big way. Two hangars were leased at the Detroit City Airport and arrangements made for a Michigan Bellanca dealership. Later that year they were awarded the Harmon Trophy for their noteworthy world flight.

In 1928 Brock and Schlee made numerous flights around the country and flew a Wright-powered Bellanca in the National Air Tour that year. In September they were at Rockwell Field, San Diego, California preparing for an endurance flight attempt. On October 1st they landed after 59 hours, 8 minutes in the air in their Bellanca plane, forced down by a fuel leak, short of the 64 hours, 25 minute record. 

On January 7th, 1929 they flew nonstop from Detroit to Miami, Florida in 9 hours, 20 minutes. During that month Brock conducted first flight tests of the new Verville air coach for the Verville Aircraft Company at Detroit. Later Brock and Schlee became dealers for Lockhead, Bach, New Standard and Avro-Avian planes, and in October took over Canadian-American Airlines between Minneapolis-St. Paul and Winnipeg, Canada. 

In March, 1930 they opened the Arrowhead International Airways between Duluth, Wisconsin and Isle Royal, Canada and that month took the dealership for Driggs Skylark planes. In April they bought the John R airport at Detroit and prepared to move their operations there. That spring they sold a Lockheed Vega plane to Crossley Radio Corporation, Cincinnati, Ohio and Brock flew this plane for them some that year. June 17th and 18th Brock and Schlee flew from Jacksonville, Florida to San Diego, California in 13 hours, 56 minutes in a Wasp-powered Vega. They refueled and rested one hour then flew back, with one stop, in 16 hours, 50 minutes, total flying time being 30 hours, 46 minutes for the round trip. They also flew in the National Air Derby in August. Brook became a member of the Early Bird organization that year. 

The partnership had over-expanded and their business folded up during the depression of the early 1930's. Following this Brook became personal pilot for former United States Senator George F. Harding at Chicago. With the Senator and a group of prominent Chicagoans they toured numerous cities in the United States and Europe.
During a flight from Washington, D.C. to Chicago in late 1931 Brock ran into 
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