Skill reward flying a bomber

so what do you have to do to get the skill bonus when you fly a bomber? today i took out 4 bases, got several crits on jet fighters (seems they are just as stupid as the prop pilots, just faster!), and had several successful bombing runs on the airbase and i didn’t get squat. What exactly are the requirements for the skill bonus for bombers anyway?

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Kill 3 planes. You can see the details by mouse hoovering over the skill icon on the score board.
But you already got a base destruction bonus for taking out all bases.