Get familiar with the definitions:
Passengers
"Passengers" refers to arriving, departing and transfer passengers. The passenger statistics do not include the airplane's crew, infants or transit passengers that do not change airplanes.
Domestic passengers
A domestic passenger departs from an airport in Finland and arrives at another airport in Finland. The nationality of passengers is not recorded.
International passengers
An international passenger arrives at a Finnish airport from abroad or departs from a Finnish airport to a foreign airport. The nationality of passengers is not recorded.
Transfer passengers
A transfer passenger arrives at a Finnish airport by airplane, changes to another airplane, and continues their journey by air.
Scheduled traffic passenger
A passenger who travels on a regularly scheduled flight operated by an airline.
Transit passenger
A passenger whose flight makes a stopover without the passenger leaving the airplane.
Charter traffic passenger
A passenger who flies on a chartered flight.
Commercial aviation
Commercial aviation is commercial air traffic, in which passengers, freight or mail are transported in exchange for a fee or rent. Commercial traffic includes regular airline service, charter and air taxi traffic. Commercial aviation does not include general aviation, training or military flights.