For general comments and complaints, Delta accepts phone calls, letters, emails, and even tweets. In the U.S. and Canada, complaints can be called in at 800/455-2720 (8 am–7 pm, M–F), or mailed in to Delta Air Lines, Inc. Customer Care at P.O. Box 20980, Department 980, Atlanta, GA 30320-2980.
To complain online, use the 4-step form for emails or tweet @Delta (the old @DeltaAssist account is no longer attended). Customer service reps keep an eye on Twitter.
Remember that when things get busy (terrible weather, widespread cancellations) and there's high call volume, the airline may require you to email unless your flight is leaving within the next 72 hours.
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