After Burner: Black Falcon Easy money
If you need extra money, replay the levels. In most of the levels at the end in the critical missions, get your missiles locked on, and go the opposite direction of the Boss. Make sure you are still locked on target, and you should not get hit with any of his booms if done correctly.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original