I disagree, the 7D just does not have critical AF performance IMO for flight, no matter how good the photographer is or how much you practice. None of the flight pros here uses a 7D. Of course if you accept soft flight shots, it's an OK camera.
When I was shooting with Doug Brown and Jim in Florida, Doug's 1D4 broke. He pulled his 7D but in a few minutes the keeper ratio dropped so significantly that he drove about 200 miles to rent a MK4.
Any ways, I suggest OP not waste his money on 7D and wait until the replacement comes out or buy a 5D3 now. that's my advice
