I have a stupid question: why if I use an airport as waypoint, in the ICAO flight plan form it is represented by its coordinates instead of by its ICAO identifier?
For example, this toy route:
(LSGG) S LFLP SJ DGN (LFMD)
is translated as
DCT LSGGS DCT 4556N00606E DCT SJ DCT DGN DCT
Isn't an airport a significant point, whose designator code (the ICAO code) is a perfectly valid route point?
Thanks for the clarification!