Many clients express pleasure with Delta's customer service and the way its phone-based operators handle inquiries and problems. Other consumers, however, have had terrible interactions with Delta customer service.

When Delta codesits flights with other airlines, one specific worry is raised. This means that although a passenger purchases a ticket through Delta, another airline actually operates the aircraft. Problems and challenges with the flight itself may be challenging to resolve in such circumstances.

Some consumers also criticise Delta for failing to follow through on promises made by gate agents or customer support staff, who then fail to deliver the promised reimbursement. Some clients must make numerous contacts to resolve the issue, or they could even need to work with outside advocates.