A scout screen does not prevent an aerial unit from landing in multiple zones of control.
This conversation has been had many times over the years and there are many (understandable) different points of view.
In both examples in the original post, a Landa/Thunderhawk etc, could land and engage the Manticores.
As per FAQ's:
Quote:
If an explanation is needed, then let’s say that the rule for moving into base contact with the enemy takes precedence over the rule for not entering another unit’s ZOC
A new FAQ has been worded (edit - I should say that the original Scout Screen from behind FAQ will stay and a new FAQ covering this particular problem has been formed) and voted on by the FAQ rules committee (with pretty much unanimous agreement). This FAQ will be available when all the FAQ's have been updated and presented to Dave.
Scout screens are more effective in preventing teleporters getting to vital formations. This is a game mechanic that prevents the free move of teleprting giving too much advantage (edit - this also works with planetfall units having to move out of a ZoC, it is an elegant and simple solution to an otherwise gamey problem).
Flying a plane in is not a free move. It has inherent dangers in CAP, AA fire, Overwatch (failing to activate in the first place) etc, that are game mechanics designed to make it more difficult for aerial units to use the advantage they have.