The quality and conditions of a functional component
or group of functional components, as experienced by
passengers in an airport, constitute the service level.
Factors such as waiting time, processing time, crowding
and availability of passenger amenities for comfort and
convenience are measures of the service level components.
Many of these factors can be evaluated in a
subjective manner or remain difficult to measure;
however, there are mathematical techniques that can
be used to evaluate some of these factors. A simple
queues theory to measure waiting time and level of
crowding, as a proxy to evaluate service level, in an
airport is used.