to obtain it you have to do landing zone (traingle) or use existing one and go to building point on it and drop hawk and enter it and jump and press circle (O) on pad :D
Hawks and all flying birds fly the same way that an airplane stays in the air. When a bird extends its wings and starts moving, air flows over the wing. This creates high pressure on top of the wing...
Condors, vultures and eagles use heat thermals, rising pockets of warm air, to carry them upwards. Hawks don't know this trick. They only have their wings.