It does say they enter Reserves and re-enter according to reserve rules. So you enter from your board edge or by deep-strike if it has the deepstrike rule. Deep striking still says you count as moving at cruising speed, so flyers do move their minimum of 18 inches as cruising is greater than 18 inches. Given the speed of Flyers, you'll likely always be in range, even if coming from your board edge, just not getting rear armour very often. I'm actually waiting for the first Flyer to get Outflank, not that they need it except in the second deployment map.
"Fetch me another plaything. This one seems to have broken." -Urien Rakarth
Space Marine- "This planet is ours, witch."
Eldar- "No ... This planet is theirs ..."