Passage: In 1934, the United States Army Air Corps put out a request for a bomber with double the bomb load and range of the Martin B-10, which was just entering service as the Army's standard bomber. In the evaluation at Wright Field the following year, Douglas showed its DB-1. It competed with the Boeing Model 299 (later developed into the Boeing B-17 Flying Fortress) and Martin Model 146.

Question: Who was their competitor?
Boeing Model 299 (later developed into the Boeing B-17 Flying Fortress) and Martin Model 146