JetBlue Airways Co. (Nasdaq:JBLU) is the 6th largest passenger carrier in the United States based on revenue passenger miles as reported by those airlines. JetBlue operates on point-to-point routes with its fleet of over 100 Airbus A320 aircraft and around 50 EMBRAER 190 aircraft — the youngest and most fuel-efficient fleet of any major U.S. airline.  JetBlue operates mainly in the Newark International Airport and in New York's John F. Kennedy International Airport, both of which are one of the busiest domestic airports in the nation. JetBlue commands around 40% of all airport traffic in New York's John F. Kennedy International Airport By scheduling and operating its aircraft efficiently, JetBlue is able to spread its fixed costs over a greater number of flights and available seat miles.
JetBlue Airways specializes in cheap point-to-point flights with high levels of customer service. The company provides service to over 60 destinations in around 20 states, Puerto Rico, and eleven countries in the Caribbean and Latin America. The company is able to maintain its industry-low CASM through aircraft efficiency and distribution costs. It has the youngest aircraft fleet in the industry, which reduces maintenance expenses, and it operates its aircraft for highest number of hours in the industry. A large majority of sales are booked through its website, which reduces operating costs. Most of its flights originate from five main airports, including Boston, Fort Lauderdale, Long Beach (CA), New York City, and Washington , with New York City's JFK airport as its primary operating airport. thank you
JetBlue operates in two geographic segments:
Typically, airline companies and aircraft manufacturers are more prone to swings in revenue and equity market prices due to the release of economic indicators. Consumers tend to reduce travel if personal economic conditions are suboptimal, forcing airlines to cut capacity and production. Indicators such as unemployment indices, personal income, and even home sales affect airline industries in exaggerated fashion.
Like all other airlines, JetBlue is vulnerable to increases in fuel prices, as fuel represents a vast majority of airlines' operating expenses. Since JetBlue is a low-cost airline service provider, JetBlue's bottom line is primarily directed by its fuel expense. To mitigate its vulnerability to increases in fuel prices, JetBlue enters into annual hedging contracts. However, sudden increases in fuel prices significantly affect even the most immediate quarter's balance sheet.
One of JetBlue's main cost-saving advantages is its "young" fleet, which has the youngest fleet among its competitors. Maintenance expense is expected to increase significantly as the fleet ages, resulting in the need for additional repairs over time.
AirTran Holdings (AAI): AirTran Holdings (Nasdaq:AAI) is one of America’s largest low-fare passenger airlines. The airline has managed to achieve low operating costs despite relying on a hub-and-spoke system, in which most of its flights originate and terminate at its hub in Atlanta, Georgia. Given AirTran's continued reliance on the hub and spoke system, airline management has cited other operational factors as cause for the airline having a cost structure that is among the lowest in the industry.
American Airlines (AMR): AMR is the parent company of American Airlines, the second largest airline in the world based on available seat miles and revenue passenger miles On an average day, American Airlines flies approximately 3,400 flights between around 250 countries. 
Delta Air Lines Inc. (DAL): Delta Air Lines is the 2nd largest passenger airline in the world by available seat miles. In recent years, the company has faced financial difficulties due to price competition from discount airlines like JetBlue and Southwest. This has limited Delta's ability to raise prices to their natural supply/demand and cost reflective levels. As a result, Delta was forced into bankruptcy in September of 2005. Since exiting bankruptcy on April 30, 2007, the company has followed a revised operating strategy calling for a network shift towards more profitable international routings. 
Southwest Airlines Company (LUV): Southwest Airlines is the largest domestic carrier by total passenger. Southwest thrives on maintaining low operating expenses, primarily through its extensive fuel hedging. Because of its low costs, Southwest was able to remain profitable for 35 consecutive years, a feat unmatched in commercial aviation history.
United Continental Holdings (UAL): The merger between Continental Airlines and United Airlines created the second largest airline fleet in U.S history. While not directly competing against JetBlue's low cost structure, UAL is a major stronghold in aviation. 
US Airways Group (LCC) US Airways is a major domestic air carrier with destinations across the U.S., Canada, the Caribbean, Latin America and Europe. The company’s finances suffered considerably due to reduced air travel following September 11th, forcing the airline to declare bankruptcy in 2002. However, unlike other carriers that improved and emerged stronger following Chapter 11 protection, US Airways never fully recovered. The combination of high fuel costs and tough labor negotiations forced the company into a merger with America West in 2005. While the US Airways name was maintained for brand purposes, the merger actually left America West executives and stockholders with more control over the new company.