How to Unlock the Top Secret Plane & The Big One
To unlock the Top Secret plane and The Big One weapon pack, just complete both the Pilot and Ace bonus objectives for the final mission (Mission 4.5-Final Count Down).
The Big One weapon pack is the fourth weapon pack for the Top Secret plane. This weapon pack, also, includes a nuclear armed cruise missile, the A-SLAMR. This weapon, however, does not recharge after being fired.
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