The Afterburner :

+200 Max primary ammo
+Uses only 1 ammo per airblast
+On Hit : Spy lose 100% cloack
+On Hit : Spy-cicle can't remelt
+25% afterburn damage when active
+On Kill : Medic whose healing will get 50% of Ubercharge
+Weapon Taunt give Crits and Uber for 10 seconds
-10 ammo per second

The Spitfire
+Knockback applied on hit 35%
+55% afterburn damage
+ -60 Self-Damage penalty
+Airshot gives you Overheal up too 230 Health
-10 ammo on secondary

Airborne Arsonist Set :
+1000% damage on Voodoo-Cursed Souls
+On Voodoo-Cursed Souls kill : Give +100 ammo and +25 Health to wearer
+On Voodoo-Cursed Souls Hit : Tag the Voodoo-Cursed Souls wearer to all team for 20 seconds
+On kill : Provide 50% Uber For Medic thats healing
-1000 Health on Voodoo-Cursed Souls attack
-Can't Airblast against Heavy's Voodoo-Cursed Souls

Seem OP?