Similarly, in the
case of two parallel runways, the capacity depends on
the distance between the centerlines of the runways.
Approximate capacity analyses for airports with two
parallel or intersecting runways are quite straightforward.
Multirunway analytical capacity models also
provide good approximate estimates of true capacity
in cases involving three or more active runways, as
long as the runway configurations can be “decomposed”
into semi-independent parts, each consisting
of one or two runways. Such models have proved
extremely valuable in airport planning, as well as in
assessing the impacts of proposed procedural or technological
changes on airport capacity.