@burmaboi The rules consistently use the term “into” when referencing the ending space of a unit’s move and “through” when referencing spaces passed through along the way. So, an air unit must conduct combat if it moves “into” an enemy-occupied space, but not “through” one (other than being fired upon by AA guns). Also, on page 14, the rules mention AA guns in “flown over” territories, which indicates that enemy-occupied territories may be moved through, and the Official Rules Clarifications make the same reference on page 2 in point 6 regarding AA guns.