Air

Air transportation is being considered by increasing numbers of shippers for regular service, even though air freight rates exceed those of trucking by more than two times and those of rail by more than 16 times. The appeal for air transportation is its unmatched origin to destination speed, especially over long distances. Air service dependability and availability can be rated as good under normal operating conditions. Delivery time variability is low in absolute magnitude, even though air service is quite sensitive to mechanical breakdown, whether conditions and traffic congestions. Variability when compare with average delivery times, can rank air as one of the least reliable modes. The capability of air has been greatly constrained by the physical dimensions of the cargo space in the aircraft and the aircraft's lifting capacity. This is becoming less of a constraint, however, as larger aircraft are put into service. For example, jumbo airplanes such as Boeing 747 and L...