A Delta companion certificate for sale. User must have an American Express card to purchase the primary ticket for the 2nd to be free + any applicable fee (no more than $80 for roundtrip domestic flights).A Delta Companion Certificate is valid for one round-trip ticket with the payment of applicable taxes and fees on certain routings within the 48 contiguous United States. Both travelers must be booked at the same time and on the same reservation, and travel must be reserved and completed by the expiration date on the certificate. If either ticket is canceled, the other will be as well.Finally, the Companion Certificate is only valid on round-trip tickets. One-way and open-jaw flights are not eligible. •Companion Certificate is valid for one round-trip Main Cabin 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.•Tickets are only available in L, U, T, X, and V classes of service for Main Cabin travel. •Travel Dates: Travel must be completed by the certificate expiration date stated in the customer SkyMiles® Wallet.•SkyMiles: Primary ticket will accrue miles. Companion ticket will not accrue miles.•Residents of Hawaii, Alaska, Puerto Rico, or the U.S. Virgin Islands must originate from there to the 48 contiguous United Stat Check all details before purchasing. No Refund.