Unlock Bonus Mission:
In ALL 35 of the regular simulator missions get at least a rank of 'B'..

Unlock XR-900 Geopelia Plane:
In Simulator mission 36 get a rank of 'A'.

Unlock U14054 Aurora Plane:
In ALL 36 simulator missions get a rank of 'A' on the Normal or Hard difficulty settings.

Unlock Orbital Satellite Laser and X-49 Night Raven Plane:
In ALL 36 Simulator missions get a rank of 'A' on the Hard difficulty setting. (The laser cannot be used in ALL missions).