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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.