link isn't working for me. Does the certificate work for flight to NAS?
Certificate only works for 48 contiguous states.
Companion certificate is valid for one round-trip First-Class, Delta Comfort+® or Main Cabin companion ticket with the payment of applicable taxes and fees detailed below and the purchase of certain adult round-trip fares on published routings within the 48 contiguous United States.
Residents of Hawaii, Alaska, Puerto Rico, or the U.S. Virgin Islands must originate from there to the 48 contiguous United States.