Pan-European Network Service
The Pan-European Network Service (PENS) is a telecommunications network established (in 2009) by several European Air Navigation Service Providers with support of Eurocontrol with a view to build transport infrastructure for current and future aeronautical applications.  
- "Environment Special Report: Using the European Single Sky to let civil and military aircraft share airspace". Flightglobal. April 27, 2009. Retrieved 2 March 2010.
- "EUROCONTROL - Pan-European Network Service (PENS)". Eurocontrol.int. 2009-10-28. Retrieved 2010-03-02.
- "EUROCONTROL selects SITA to lay foundations for the Single European Sky". SITA.aero. 2009-10-28. Retrieved 2010-03-02.
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