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As per title.. My Google-fu is weak and has really only found discussions on the -effects- of air combat at night and whether or not it's worth it, but not how to enable it..
Also, while you're at it, also click on the button with a fist and select normal operations (I think), the one with the yellow bar. This will greatly reduce losses and frankly should have been the default option.
Then again, I know air is being reworked in the next update, so fingers crossed .