Fastair (like my fb name?) was not a system or GDS, it was a GUI overlay from the Apolli GDS, which is of the same era as Shares. IMHO, Apollo was better but Shates is stronger in a few ways. There is a GUI for Shares too, both for tea and CS. By the way Fastair was NIT used by pre merger UA res agents, I believe their GUI was called ezres or something like that.