American Airlines Group Inc. (NASDAQ: AAL) is the largest commercial airline carrier in the United States. With the largest fleet, most passengers, and over 5,400 daily flights, the company is a key bellwether in the transportation sector for the commercial airline industry. Therefore, when American Airlines surprisingly issues downside guidance, systemic concerns about the travel industry naturally creep up. Investors in rival carriers like United Airlines Holdings Inc. (NASDAQ: UAL) and Delta Air Lines Inc. (NYSE: DAL) are naturally spooked and question whether their stocks will also suffer a sustained sell-off.
