By working together to provide enhanced links for connecting passengers the airlines would expand customer choice via integrated networks, new non-stop routes, additional frequencies on existing routes and combined fares. (breakingtravelnews.com)
These requests could be made for additional frequencies, new / extra entry points and additional designation of airlines (multiple designations). (nigeriapoliticsonline.com)
This problem has forced cellular providers to build higher - power transmitters and to use additional frequencies. (scientificamerican.com)