We will be flying into IST on May 21 from Milan, Italy on Turkish Air, business. We will have our E-visas. I am American and my wife is Italian. We will be connecting on that day to Izmir. We do not have tickets for the ongoing flight yet and since I am using miles on the flight from Milan I cannot add on the continuing trip to Izmir. I will be purchasing ongoing separate tickets on line. I reviewed the comments about transiting at the Istanbul airport but am unclear about a few things.
In my planning for the ongoing flight, how much time should I allow to transit to my ongoing domestic flight? I am not sure if I purchase the separate ongoing ticket on Turkish Air that I will be allowed to check luggage through? So does it matter what airline the ongoing flight is purchased for?