Land Base Aerial Support

Introduction
The Land-Base Aerial Support (tentative name) is a system introduced in the May 2nd-3rd 2016 update along with the Spring 2016 Event, which enables carrier-based and land-based aircraft to be launched from air base and assist you during the sortie.

Prerequisite
Currently, the only way to unlock the air base is to clear E3 and E5 during the Spring 2016 Event.

How To Use
First introduced in Spring 2016 Event, after clearing the Map E3, you'll be able to establish an air base from which you can launch aircraft from. You can launch carrier-based aircraft and seaplanes, as well as land-based aircraft that is exclusive to this support system.

In certain maps where land-base aerial support is available, you can activate the support and assign aircraft to the airbase as shown here:

When the land-base aerial support is active for that map, a mark will be displayed below the sortie button.

At the start of the sortie, you can designate up to two target nodes where aerial support the will be performed. You can also select a single node in order to concentrate all of your aerial supports there.

When you reached the node where the aerial support is requested, a land-based airstrike will be performed against the Abyssal fleet before the carrier-based air battle, support shelling and initial torpedo strikes. If the land-based aerial support is equipped with fighter or interceptor aircraft, then they can secure the air superiority if the aerial support has enough air power to do so.

Trivia

 * When the system was first implemented on May 3rd 2016, there was a bug that caused the bombing damage from land-base aerial support to be omitted from internal enemy HP damage calculation, which occasionally causes a supposedly sunk enemy unit to be able to act as if they were alive (able to attack/be targetted by your fleet), as shown here