# Commission Regulation (EC) No 29/2009 of 16 January 2009 laying down requirements on data link services for the single European sky (Text with EEA relevance), Division 3

Extent: E+W+S+N.I.

Communication protocols must support bidirectional point-to-point communications using those parts of the radio frequency spectrum identified by ICAO as suitable for air–ground data communications in support of air traffic services.

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Source: https://www.legislation.gov.uk/eur/2009/29/annex/IV/part/D/division/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-2009-29/annex-IV/part-D/division-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.