So I'd like to suggest these be made easier to see, I suggest golden or just white.
Maybe they could even be made bigger than the default little tick in the planner?
Anyway I'd prefer golden so I've made a small mod, plop these in the Graphics Override as usual.
Sample:

This is also more consistent with the golden outline of selected ground attack units.
Note I'm not really sure where those lie in the yellow/green spectrum - not good with those shades either [8D]
Suggestions/improvements welcome.