If you work for IATA and you are eligible for non-rev travel, you can join StaffTraveler.

During the onboarding process, you'll be asked to select the airline you work for. IATA is not on this list because the list is dynamically updated with airlines by our flight data provider. Please select a random airline from the list to continue the onboarding process. This will not affect your account other than open requests for the selected airline shown on your Loads screen. 

Later in the onboarding process, you will be asked to prove your employment by an airline. Submitting proof of your employment by IATA or your eligibility for non-rev travel will suffice and result in your account's activation.