One plane flies with him a quarter of the way around the world, giving him half a tank of fuel at the quarter mark and then turning around and returning to the runway.
He now has enough fuel to make it to the three-quarters-around point.
When he is halfway around the world, the third plane begins flying toward him. When they meet (at the three-quarter mark), it turns around, gives him a quarter tank of fuel, and flies back with him to the runway.
I'm guessing that's the solution you had in mind, although there are some practical problems with timing the refueling, and accounting for the volume of fuel in the refueling hose, and the fact that the circumnavigating plane will run out of fuel exactly at 3/4 around, and details like that.