The concept of placing the controller at the airport has remained unchanged since a ATC was introduced after the second world war. This involves a number of limitations to the concept of operations. Some of these are:
   - Low utilization of personnel recourses
   - Need for redundant recourses at each ATC unit
   - Adding new aids and sensors often implies stand-alone equipment
   - Stand-alone adds to the head-down time removing focus from the primary field of view
A cost benefit analysis performed by the LFV Group in Sweden regarding a paradigm transition to perform ATC services from remotely operated towers focusing rural small and medium density airports, shows economical benefits by more efficient staff enrolment, compared to traditional ATC operations from local towers at each airports.