A doors off sunrise helicopter flight over the Kaikoura Ranges with South Pacific Heli was an absolutely mind blowing experience and far exceeded any expectations I ever had. Seeing the suns first light hit the mountains and paint the snow tipped peaks pink and orange whilst buzzing around in a helicopter with no doors on is something I hope everyone might get to experience just once in their lifetime.
Photographing from a moving object like a helicopter at sunrise can be quite a challenge but my best advice would be to set your ISO high, your shutter speed at least 1/500 sec and your aperture around F7. You will need to constantly adjust your ISO as the sun rises and the scene gets lighter, so it definitely requires some effort.