1. What is a Fare?
Airfares are most often based on one-way or round-trip travel. Fares may be published, unpublished and/or negotiated fares (corporations, or government agencies/organizations may have fares negotiated with an airline at a lower rate). Unpublished fares are also known as consolidated fares and are offered by consolidators and bucket shops.
A published fare is one that is available for purchase by anyone. An unpublished fare works a bit differently.
When booking a ticket, regardless of whether it is using a published or unpublished fare, there are letters that are assigned to different fares. These letters indicate the class of service, not simply indicating economy or business class, but rather the type of fare that was purchased.
Explanations for the different types of airfares such as APEX and full fares.