The fleet is very powerful and effective way of fending off tractionists. However, it is only used for defensive purposes, and will only attack Traction Cities if they threaten a static settlement. The air fleet includes Air Destroyers, Fighter airships and normal airships.
When London threatens to destroy Batmunkh Gompa, the Anti-Tractionists do not take it as a serious threat as they could destroy the traction city with the Northern Air-Fleet before it came into range of the Shield Wall. However, during a religious festival the entire fleet is single-handedly sabotaged by Valentine, leaving them helpless.
With the air-fleet gone, many static settlements were left helpless, including Spitzbergen static, which was devoured by Arkangel. After the Green Storm War the Northern Air-Fleet may have been re-establised by the Anti-Tractionist League to defend static settlements.