Interdiction

[Aaron]

It does factor in the terrain you are passing threw, you will be alot more likely to have interdiction going threw clear terrain then you will going threw a city hex. From what i know if the terrain mod of a city is -40% then youll have 40% less chance of getting hit going threw the city hex than you will a clear hex.

As units move on the map in Travel or Rail Mode, there is a chance that their
movement will be Interdicted by enemy air units. This probability is based on
Parameter data per side (see the Parameter Data Dialog in the Main Program).
The probability is based on the total number of units in Travel or Rail Mode in
the hex being moved into. The probability is modified by any terrain modifier of
the hex being moved into. The probability is half during Dawn and Dusk turns.
If Interdiction occurs, then an Air Strike occurs against a unit in the target hex
using an air unit that is representative of the type of air unit available to the
enemy side. However, this air strike does not count against the air units
available by the enemy. Note in addition, that movement by units in Deployed
Mode into hexes occupied by units in Travel or Rail Mode can also trigger an
interdiction attack against the units in Travel or Rail Mode.

In addition as long as you have AC available on that turn interdiction will happen as normal weather its 1 AC available or 100.

Aaron