travel
http://travel-in-airlines.odoo.com/blog/our-blog-1/ways-to-contact-delta-airlines-customer-service-via-phone-email-chat-a-full-travel-guide-657
http://pantip.com/topic/43396047
http://pantip.com/topic/43396050
http://otx.alienvault.com/pulse/67ffc79b154d3dfa67b5dff3
http://travel-in-airlines.odoo.com/blog/our-blog-1/8-ways-to-reach-delta-airlines-customer-service-by-phone-chat-and-email-stepwise-assistance-guide-658