Originally Posted by
Stryker1112
I was searching for low cost fares DFW-CDG, saw the list and confirmed it was active, but when I called the airline and gave them that particular code, they said their system wasn't showing it.
Have you tried looking for flights on which the relevant booking class is available, and pricing the itinerary to see whether not the fare is valid for the itinerary? There are many reasons why a fare that is published and visible on EF cannot be used for a specific trip.