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Here we try to keep an up-to-date list of who-goes-where. Finnair may have tuned the boarding groups since the first introduction, so some entries here are not confirmed.

Pre-boarding (those in need of assistance, UM, travellers with children of any age)
Group 1: J-pax, AY Lumo, AY Plat, Oneworld Emerald
Group 2: AY Gold, Oneworld Sapphire
Group 3: AY Silver, Oneworld Ruby
Group 4–5: Other customers, depending on seating

Assignment of group
Group is assigned based on ticket type and status of individual frequent flyer card attached to booking. All customers on the same booking are assigned the same group, i.e., based on the highest tier in the party.
The boarding groups are printed on paper boarding pass on every route with capital letters "GROUP 1". The group also appears on digital boarding passes.

Enforcement of Boarding order
Enforcement of groups is haphazard. Sometimes groups are called out, sometimes a call like "we invite our priority customers to board first or at any time". Groups are rarely checked on boarding though and on shorthaul no aids (like ribbons, signs) are used either. At HEL automatic boarding gates have been introduced which means "priority boarding" in now enforced.