A Quartermaster's worst nightmare

[Dog Soldier]

As RickyB mentioned, air interdiction is a factor of how many and what quality of air units are held back by the side with the capability. It is a trade off with ground attack missions. If your in the habit of flying all your attack squadrons each turn and only have recon air left, then you will see the enemy moving fast and accepting the low casualties. Hold back a good number of air strikes if you really can not achieve anything decisive that day with them and watch the interdiction go up.

Dog Soldier