Aircraft fires.

[Strike]

At the moment I am simply shocked over how detailed the damage model is. They have REALLY improved over the previous installment.

So far I've seen:

Bf-109 cannon ammo explode and rip off wing.
Spitfire oxygen tank blastout
Spitfire radio smokepuff
Spitfire individual exhaust-stack showing a bad cylinder (yellow flames out of only one exhauststack)
Bf-110 Right gear uplock failure (gear drop)
Spreading fires
Destroyed shock-struts (no compression)
Destroyed flap hoses, brake-lines, tires etc.

The FLAK explosions also are very neat with physical modeled shrapnel that hit you in a realistic manner. Also the ground explosions spread shrapnel.

Very very impressed!