A18 is often used nowadays, not unusual to see B777 or B787 parked up. Actually A14, A16 and A18 can all take up to B744, I saw three of them lined up Christmas 2008! And during COVID, you could see three B777/B787s in a row on T5A. I think they use A18 as an arrival gate and tow off more often than a depaeture.