Aerial photography offers a drastically different perspective than the one you get from shooting on the ground. It includes photographs taken from aircraft, helicopters, balloons, rockets, kites, skydives, etc. It can be a rewarding, challenging and enriching experience. It can produce unique shots that look different than any other ground shot you have ever taken. Scenic flights can give you some great, memorable photos.
source: http://www.smashingmagazine.com/2008/12/21/75-eye-catching-examples-of-aerial-photography/