This is the 6576th most frequent Russian word.
finnair
The word "finnair" is not Russian; it is the name of Finland's national airline.
In this sentence, 'Finnair' serves as a proper noun, referring to the name of the airline.
Мы летели в Хельсинки рейсом компании Finnair.
We flew to Helsinki on a Finnair flight.
Here, 'Finnair' is used as the subject in the sentence representing the service provider.
Я купил билет у Finnair, потому что у них удобное расписание.
I bought a ticket from Finnair because they have a convenient schedule.
'Finnair' in this sentence is subject of the sentence and indicates the company being described.