I know that Aero Airlines were not a success story. However, I think that the loads have come down on the Helsinki-Turku route. Does anyone else remember the announcements (something like this): Welcome on board on this Aero Airlines flight to Turku. It is a joint service with Finnair. We also co-operate with Air France, British Airways and Swiss International Airlines.
The code-shares were dropped when FinnComm started the operation. Aero was considered to be an AY company but starting with a new private company pushed AF, BA and LX away (LX would have stopped anyway). Even a couple of extra passengers could make a difference in the earnings.