Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT Executive, AA, BA, SK, DL, NT, WB + hotels
Posts: 10,257
This might be airline-dependent but if you're flying AY and connecting airside international-international at HEL, you will not need a test certificate to board the AY plane to HEL.
We do not know, however, whether both flights need to be on the same ticket.