Delta is the sixth-oldest operating airline by foundation date, and the oldest airline still operating in the United States. The company's history can be traced back to Huff Daland Dusters, founded in 1924 in Macon, Georgia as a crop dusting operation. The company moved to Monroe, Louisiana and was later renamed Delta Air Services, in reference to the nearby Mississippi Delta region, and commenced passenger services on June 17, 1929. Among predecessors of today's Delta Air Lines, Western Airlines and Northwest Airlines began flying passengers in 1926 and 1927, respectively.