no it's not safe "landing" it's "ditching" in your area...
ie if they were at your base they would be "captured" and thusly you'd get a "kill" message.
but if you are at the enemy base and they ditch in that "sector" it counts as a safe "ditch" no kill awarded.
this is a problem that has bugged me quite a bit. but i dont know how it can be fixed.
the "area" that you can ditch w/o being captured is unknown to me .. i have been "captured" within 5k of a friendly base and yet ditched "successfully" within 5k of an enemy base before.
oh well my 2¢