) are higher on the session by 0.60%, currently trading at $11.66. The stock has been moving largely lower over the past six months and is currently trading below the 50-day and 200-day moving averages. Options traders are buying calls on the name today. A short while ago the June 2011 $12.00 call was purchased 5,000 times, on the offer, on open interest of 16,509 contracts. Overall call volume is now running at 2.62x the daily average with 96% of all calls traded being purchases on the offer. Southwest Airlines Co. is a passenger airline that provides scheduled air transportation in the United States. As of December 31, 2010, the company had 548 Boeing 737 aircraft serving 69 cities in 35 states throughout the United States.