How to set a different location of large area for routing

Hi,

I got a problem with location "Oulu aerodrome" and its coordinates with trip planner / routing.

Example here: https://oulu.digitransit.fi/reitti/Oulun%20lentoasema%20(liikennealue)%2C%20Kyl%C3%A4npuoli%2C%20Oulu%3A%3A64.929363%2C25.357086/Selected%20location%3A%3A64.93126173227539%2C25.381593704223636?time=1509087128

In the example below, it suggests that a person would walk from the airstrip (when given "Oulu aerodrome/Oulu lentoasema" as the starting location).

Is it possible to determine a different location for routing /trip planners?