Change rule “Upstairs, Downstairs” to read:

Each Ant or Creature is either Underground, Above Ground or Flying. This is tracked in the GNDT under the column entitled “Location”. New Ants start Underground, and newly created Creatures start Above Ground unless otherwise specified.
If not specifically forbidden by another rule, as a daily action an Ant may change their Location to Above Ground or Underground, but not more than three times in any seven-day period. A Creature may not have its location changed unless such a change is specifically mandated by another rule.
If an Ant has been Flying for 7 days without interruption any Ant may change their health to 0. That Ant is not considered killing the flying Ant nor making it die directly.

In rule Castes:
add to “Drone”:

If they own 5 food and Weather is not snowy, Drones may change their location from “Above Ground” to “Flying” by spending 5 food.

add to “Virgin Queen”:

If they own at least 3 food and Weather is not snowy, Virgin Queens may change their location from “Above Ground” to “Flying” by spending 3 food. When Virgin Queens are in Flying location with one or more Drones, they may Mate with one of them. They changes their Caste to Mature Queen and their location to Above Ground. They shall change the partner Drone’s Caste to Worker, his Location to Underground, increase his CP by 15 and change his Antribute to Obediant, if not already.