Here at HIS we have 3 basic classes of aircraft.
Fighters, which many players start with, and are for high manuverability and combat.
Gunners, which is a heavier fighter, and able to carry more weapon types, as well as having recovery skills.
Bombers, which devistate the battlefield with impressive weaponry and offensive power-ups.

Furthermore, we have subtypes of each aircraft.
Fighters
Speed fighters, faster fighters, which use speed to outfly an enemy.
Mobility fighters, nimble fighters that can loop around almost any other aircraft.
Firepower fighters, what they lack in mobility they make up in bullets!
Gunners
Combat gunners, these behave more like fighters, and carry more air-to-air weapons.
Support gunners, these behave more like bombers, and carry more ground attack weapons.
Bombers
Dive Bombers, fast bombers, has a lower bomb load, but are smaller and harder to hit.
Heavy Bomber, these are level bombers, meaning they level the target below them. Thick armor and a high attack make these great for missions!

Once you have picked an aircraft you like, simply click [produce] on its factory icon. If you have enough tech points, the aircraft will be produced, and you can press [board] to fly it. But if you don't have enough tech points, you will have to level up for a few more times to get them!

You can build aircraft based on level. Once you reach a level 42 plane, there are a few extra steps.

Once you hit level 42, you can no longer produce planes from just tech points.
Remember that copper you got in Clouds of War that you had absolutly no idea what to do with?
Well now you need it, and many other materials.
Heres a list:
Motor Steel Beam Spring Aluminum Plate
Steel Wire Shaft Copper Steel Plate
Radiator Battery Bulletproof Plate Alloy Plate
Tempered Glass Gunpowder Lumber

When you go to buy a plane, you see it now has a material cost as well. It will have any number of those materials, and you will also see you now need a Blueprint (Draft). There are 2 ways to get one, the first, and most easy is to buy it from the item shop, but it can get pricey. Second, you can find them in missions, in the same way you got the materials, but it is very rare.

Once you have the blueprint and the material cost, build the plane!

Premium planes are like normal planes except they cannot be purchased using tech points. They are purchased using HIS$ in the premium shop.
Unlike normal planes, they do not have any prerequisites or trees needed to buy them.

Once you have bought a premium plane, you will have it forever.
However, what happens when your plane starts to be to weak against your foes?
You upgrade it!

This is fairly easy to do, but requires another HIS$ item, the Premium Upgrade Kit (PUK)
First you find the plane you want to upgrade, and find out how many PUKs it needs to upgrade. For level 16 you need 2 PUK, and the number will go up from there. At some point once you need 18 PUK per upgrade, it will drop back down to 11 PUK the next time, and stay at 11.

Gather your PUK and press [upgrade], and now your premium plane will last a little longer!