https://collaboratory.gse.upenn.edu/sites/default/files/webform/12-Ways-To-Contact-Delta-Airlines-Usa-Contact-Numbers.pdf
https://collaboratory.gse.upenn.edu/sites/default/files/webform/18-Ways-To-Call-Delta-Airlines-Customer-Care-Full-Guide-Usa%20%281%29.pdf
https://collaboratory.gse.upenn.edu/sites/default/files/webform/21-Ways-To-Reach-Delta-Airlines-Customer-Care-Full-Guide-Usa.pdf
https://collaboratory.gse.upenn.edu/sites/default/files/webform/12-How-Can-I-Speak-To-Human-At-Delta-Airlines-A-Step-Wise-Guide.pdf |