They fly the plane downward, matching the vertical acceleration with the acceleration caused by gravity. You owe it to yourself to see these amazing videos filmed on planes that simulate zero G: OK Go - [this video] Physics Girl - [link] Veritasium - [link]
A number of their music videos are quite creative: * in a zero-G plane: [this video] * one-take (?) on electric unicycles: [link] * 4.2s real-time scene with the footage slowed down to 4 minutes: [link] * Chevrolet-sponsored video where they use a moving car as an instrument: [link]
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