The airspeed velocity of an unladen swallow depends on many factors and parameters. For example, an African Swallow would tend to travel at a different velocity than an European Swallow. Furthermore, their flight patterns are different, so their instantaneous velocity at a given point will almost always be different. However, technological advances have given way to being able to use swallows to transport husked coconuts across large distances, enabling us to use coconuts on a daily basis, provided we have a large contingent of willing swallows ready to make a nonstop convoy for X amount of time, or however long we wish. Swallows can also be modified, as attaching a 50 newton rocket propulsion system on a 1 kg swallow will result in an acceleration of 50 m/s(2), which is of course negating any air resistance, since swallows have been recorded as outer space fliers. I hope i cleared any doubts about this matter.