The description of two airlines is given below. One is Delta and one is Blue Jet.

Company A is a major airline that flies both domestically and internationally and offers additional services including travel packages and airline repair. The company owns a refinery to supply its own jet fuel as a hedge to fuel-price volatility. In 2008, this company merged with one of the largest airline carriers in the United States. Company B operates primarily in the United States, with some routes to the Carribean and Latin America. It is the leading low-cost carrier in the United States. The company carries only 3 different aircraft in its fleet, making maintenance much simpler. This company's growth has been mostly organic. Determine which is Company A and which is Company B. Give 3 reasons why your decision is correct.