From 1987 to 1990, David Diez participated in the planning, coordination, management and implementation of the European Space Agency (ESA) satellite communications project PROSAT/PRODAT, in which the Spanish DGAC, the British CAA and EUROCONTROL were involved.
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The PROSAT/PRODAT was mainly a pioneer experimental program on Automatic Dependent Surveillance (ADS) and Controller Pilot Data Link Communications (CPDLC), using INMARSAT satellites.
During the trials the Spanish DGAC succeeded in being first in controlling a flight via satellite data link.
Click below to see some magazine articles giving details on this subject:
ICAO Bulletin FEBRUARY 1989
Boletín OACI FEBRERO 1989
Bulletin OACI FEVRIER 1989
Revista de AERONAUTICA Y ASTRONAUTICA Nº 615 AUGUST / SEPTEMBER 1992
ATC Magazine Nº 6 OCTOBER / DECEMBER 1995