Some friends of mine are traveling to Turkey (May 23rd-June7th). Were able to get tickets to Istanbul with the AMEX points, a combination of DL & KL flights.
If they want to fly to Ankara, Antalya, Izmir, etc. would they need to make reservations from here w/ TK or would it be possible to book flights there without paying additional bucks for lack of 2 weeks advance purchase, etc. (any discount local career advise is greatly appreciated)
Thank you in advance for your help and input.