It seems that the FAA and Eurocontrol have waypoints with the same ID.
For example, the route between KJFK
and LFPG
for a recent flight reads as
KJFK..BETTE..ACK..VITOL.N73A.SUPRY.NATY.ATSUR..GAPLI.M25.ANNET.UM25.UVSUV.UM25.INGOR.UM25.LUKIP.LUKIP9W.LFPG/0555
How can one tell that the ANNET
waypoint corresponds to the European area and not to the US? I mean in an automated manner, of course when looking at the map one can tell.