Graybeard
The BEA instigated "Flight Data Recovery Working Group Report" has indicated that the cost of an ACARS message via SATCOM is $US0.25, and that to include a AOC position report with each ACARS message would add about 5 percent to the cost.
It is something that they recommend implementing immediately for those already using ACARS via SATCOM and flying Oceanic routes.
http://www.bea.aero/en/enquetes/flig...nal.report.pdf
mm43