Originally Posted by IAATM

P.S. When you're departing IST the next day, assuming you're *A Gold, don't forget to use the separate *A Gold entrance to the international terminal, since it'll get you through the metal-detector line much quicker. Similarly, once you're inside the terminal and have your boarding pass, look for the special entrance to the TK lounge, with it's own security and passport control - but you can only use this lounge entrance if you're on TK (i.e. it doesn't work for UA passengers).