Absolutely 100% they should have a plan that if appropriate to the route goes via controlled airspace class B,C,D,E,F and G. i.e. airspace available to VFR flights
I agree 100% with this.
Uncontrolled airspace almost does not exist over here. Everything is planned through controlled airspace.
We transition Delta and Charlie airspace regularly. Entering Bravo airspace is usually possible off-peak with priority given to aircraft landing and departing at the field.
which leaves them heading into controleld airspace without any pre-planned heanding or route and opens up the posibility of wandering round inside the zone which I believe is worse than wandering round outside it.
Not sure about Euroland but Delta in the US is too small to "wander around" in.
If in Charlie or Bravo, we can "request vectors to [place name]" and from that point we resume our own navigation. This is essential and encouraged as we can get vectored around all over the place.