Non-refundable ticket changes will cost you. As of 2013, Delta charges $150 for changes to domestic tickets and $250 for international tickets. If you booked your Delta flight through a travel agent or an online agency, you will be charged an additional $50 to make any changes to your ticket.
In the U.S., approximately 3.3 million people have OCD, of which you have 0.3 to 1% of pediatric population and 2% of adult population. So about 1 out of 200 adults have OCD and twice as many have had OCD at 1 point or another in their life.
Of those 40 million people, almost 7 million of them suffer from GAD, with 15 million suffering from social anxiety disorder, 14.8 million suffering from major depressive disorder, and 7.7 million affected by post-traumatic stress disorder. Fact #3: There are many types of anxiety disorders.