Air Knife

Air Knife (エアナイフ Ea Naifu), also known as Air Lance or Air Lancet, is a recurring weapon in the series. It is usually a mid to high-level knife that inflicts Wind-elemental damage when attacking, and is usually one of the few Wind-elemental weapons in the games it appears in.

Final Fantasy III
Air Knife is a high-level knife used by Onion Knights, Thieves, and Ninjas. It provides +89 Attack, +6 Agility, and inflicts Wind-elemental damage. It is found in the Sunken Cave.

Final Fantasy V
Air Knife, originally called Air Lance, is a high-level knife that inflicts Wind-elemental damage and also provides a bonus to all Wind-elemental damage dealt by the wielder. It provides +53 Attack, and can be either bought in Moore for 6800 gil, or stolen from Moss Fungus. It can be used by every class with the exception of the Monk and White Mage.

Final Fantasy VI
Air Knife is a mid-level knife, and can only be used by Locke, Strago, and Relm. It has an Attack of 76 and is Wind-elemental. It can be bought in Narshe, Kohlingen, and Tzen for 950 gil in the World of Balance, found in the Returner Hideout, stolen from the enemy Devil Fist, or won from the boss Tunnel Armor.

Final Fantasy Tactics
Air Knife is the second strongest knife in the game, with Zwill Straightblade being the strongest. It has an Attack of 10 and Defense of 5%, is Wind-elemental, and can be bought in Chapter 3 for 8,000 gil or poached from Ahrimans.

Dissidia Final Fantasy
The Air Knife is a level 50 dagger that adds 34 to Attack and increases the EX Gauge by 15% at the start of the battle. It can be traded for at the shop for 14,910 gil, a Piercing Dagger, a Great Serpent's Fang and a Transmogridust.

Dissidia 012 Final Fantasy
The Air Knife is now at level 30 and increases ATK +34, DEF+2, and fills your EX bar by +5% at the start of a battle.