During this step, Axis land units move and patrolling Allied fighters react. Each fighter in a region rolls to strafe each Axis unit moving into or out of that zone, including reinforcements. The Axis player indicates all units that are moving, then the Allies fire one at a time against target units.
Coordinated Landing simply allows you to land units in any of that country’s landing zones regardless of which Beachhead they’re in. Of course, you must still observe stacking limits.