Fast Lane service is available at the Security Screening points of the Main Terminal Building of Athens International airport provided by the airlines to eligible passengers as defined in their terms of service.
Athens Airport provides the facilities & the handling of check points. Reservations are made through the airlines. The check points are staffed by airport personnel who allow entrance to passengers that fulfill the service conditions as instructed by the airline they are travelling on the same day.
If you are a privilege card holder of a specific airline that provides access, in order to use it, you must travel on the same day with the said airline or with another member airline of the same global alliance. You may check with your airline directly if it is included in their offered services, additionally to the eligibility of Business lounges access & find out more about the specific terms & conditions that apply.
Contacts of airlines can be found here: https://www.aia.gr/traveler/travellers-info/airlines/
Even when using Fast Lane service, you must allow plenty of time for check-in, security checks and passport control procedures, if required according to your destination. Please note that late arrival at the departure gate may result in denied boarding.