If you want your child to have loads of fun and to get in the air instead of on the ground, get an AirHogs AeroAce airplane. You can't have any wind outside, but on a calm summer evening, he can fly it very easy.
I started out in the RC flying hobby with an AirHogs AeroAce plane. The hobby folks went nuts over this little airplane. It flies and it flies fantastic. You can fly it into the house, into the cars, into the younger sibblings and there will be no damage to the plane or to whatever they crash into.
I bought mine in 2005 and then bought an actual hobby grade "beginner" airplane. After crashing the hobby airlpane a few years ago once too many times, I still have my 2 AirHogs airplanes and still fly them.
My wife said to me one night after looking out the window at me, "You have this stupid looking grin on your face out there, what are you doing with the plane?" Every evening, I would toss the plane up to fly and after a few minutes, I had about 20 barn swallows arrive from somewhere (I live in the country) and would swoop and fly all around the plane. It was crazy.
The mention of the Airhogs helicopter made me think of the plane. I have a helicopter as well and it is an indoor toy only (absolutely no wind and the IR signal won't reach the heli outdoors.) It would not be nearly as fun for a child because they are extremely difficult to fly. I can only make about 2 circuits around the large basement before it crashes to the ground (no damage though, just like the planes.)