Here is an interesting tidbit from mmdnewswire.com,

"Let's take a quick, high-level look at insider trading at Delta Air Lines Inc /de/ over the past 12 months. A total of 654,185 shares of Delta Air Lines Inc /de/ stock was sold by insiders, totaling $7,041,285. Over the same time 12 month time period, no shares of Delta Air Lines Inc /de/ were purchased by company insiders."

The full article Delta Air Lines Inc /de/ (DAL): USD 554K of stock sold by Edward Bastian

Theories anyone?