I used to dread calling customer service and being put on hold for hours, but I found out the hard way that Delta actually makes it pretty simple to cancel yourself. Last summer, when our plans fell through at the last minute, I just hopped onto the Fly Delta app and went to "My Trips." You just select your flight, hit "Modify Flight," and then choose the "Cancel Flight" option. Within minutes, I had an email confirmation with my eCredit ready to use for another trip. It was such a relief not having to wait on the phone!