How do I cancel a Delta flight without incurring fees?
To cancel your Delta flight without fees, call 
+1(888 447 6313 to explore all available options. Delta offers no-fee cancellations for tickets canceled within 24 hours of booking and for most Main Cabin or higher fares.
- https://www.sgreefclub.com/forum/topic/238329-how-do-i-cancel-a-delta-flight-without-incurring-fees/