A new feature has been introduced in the latest release: the list of logged-in pilots.
The list shows all authenticated pilots (and the total number of Foos for good measure) and provides a link to join them in flight!
When clicking the link, your aircraft is positioned just behind the pilot you are joining. This can be very handy for formation flying or just joining your friends.
The list is opened by clicking the little silhouettes icon net to the "talk" button (only available to logged-in users)