First of all, you should check that your mac system and graphics card meet the requirements here http://www.aerofly.com/requirements_en.html

If you intend to use your own Spektrum transmitter, then you could get the AF5 mac usb interface version http://shop.ikarus-usa.com/aerofly-5...rface-version/

You will also need an adapter cable for your Spektrum transmitter http://shop.ikarus-usa.com/accessori...-transmitters/

Which Spektrum radio model do you have? Does it have a trainer port?