Last year flew Istanbul to Antalya, Antalya to Istanbul, Istanbul to Dalaman, Dalaman to Istanbul and home no problem just like getting on a bus hardly any waiting, one time we were still outside the airport just 1/2 hour before we were due to take off !! I was panicking, Turkish friends couldn't see any problem.

All flights Turkish airlines. Very easy, fast and cheap about £20 per one way trip.