The cancellation of postal flights between Helsinki and Oulu will have the greatest effect on mail traffic between southern and northern Finland. However, the rest of the country can expect post delays as well. There could also be holdups in some deliveries between Finland and other countries.

First class letters, express mail and some newspapers and magazines are dependent on air delivery. Itella says it will try to cut back on the disruption to the postal system by relying on land deliveries and substitute air transport.

Mail deliveries on Monday were not affected by the strike.