
The airline will be trialling the system for six months by installing check-in kiosks at the departure hall of the Arlanda Express train, which transports customers to Arlanda Airport in approximately 20 minutes.
This will save time for a number of busy passengers as the check-in kiosks can print out boarding cards and baggage tags, with customers' luggage able to be dropped at the airport at the baggage drop desk.
Check-in is also available for passengers embarking on a connecting flight at the Finnish capital, Helsinki.
Finnair operates seven flights to Stockholm from Helsinki each day.
Elsewhere, Finnair passengers flying to Osaka will now travel on new Airbus A330 aircraft, a move which came into effect on July 6th.
This brings the total number of the airline's A330 routes to four after New York, Delhi and Nagoya.
It is hoped that Finnair's fifth A330 will be added to its fleet by the end of this year.
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