https://ia903104.us.archive.org/27/items/del-ta-airlines-verified-service-number/official-list-of-tmamerican-airlines-customertm-service.pdf
https://ia903206.us.archive.org/18/items/del-ta-airlines-24-7-number/del-ta-airlines-24-7-number.pdf
https://ia903206.us.archive.org/18/items/del-ta-airlines-24-7-number/del-ta-airlines-live-service-number.pdf
https://ia903206.us.archive.org/18/items/del-ta-airlines-24-7-number/del-ta-airlines-verified-service-number.pdf
https://ia903206.us.archive.org/18/items/del-ta-airlines-24-7-number/del-ta-airlines.pdf