Slitherine

I encountered two bugs in this scenario with the secondary objective of "Destroy 20 Aircrafts"

• If you destroy a hanger from those island garrisons with multiple planes stored inside, then this can push you instantaneously over the goal of 20 destroyed planes.
  As result the objective completion will never trigger. Seems you need to hit 20 spot on.
  
• The reward for fulfilling the objective is the emerging of pilot ace Commander K. Wilson. However you could recruit him in Midway already. Therefore, if he is in your core you get nothing.

Ah, well spotted.