USADreamliner From , joined Dec 1969, posts, RR: Posted (8 years 7 months 2 weeks 21 hours ago) and read 2116 times:
I was looking at this picture from FRA (1970), and I noticed that the check in counter was shared by SR, KL and SK. They were part of the KSSU Group, Austrian was not part of the group, but they were close to SR until they separated decades laters from the Qualiflyer Group. So, this "cooperation" was something common in other airports? I thought the group was just a cooperative mainteinance agreement.