Due to upcoming changes to the technical systems of our website, the social login integrations for Yahoo and Twitter will be soon removed.
You will still have the option to login using AirwaySim account's own username/password combination, or the social logins from Facebook and Google.
If you are one of the ~30 users who have used Yahoo or Twitter logins in the past please make sure a) your AirwaySim user account has a valid e-mail address and b) you know the password for your AirwaySim user account. (Visit the My Account (https://www.airwaysim.com/Profile/) page to make changes)