After a day's searching I thought I was so lucky to find a connecting flight on Transportes Aero Regionais from Istanbul to Sanliurfa that would work with my 4:40 pm arrival time. The flight came up on Cheaptickets along with a Turkish Air option at 20:30 that would also work but was more expensive. I booked the TAR flight (despite muffled misgivings when I wasn't able to google anything that would place the Brazilian airline in Turkey, and indeed, came up with a safety record that justified vague indications that the airline might actually be defunct). Nevertheless, received a confirmation of successful booking from Cheaptickets, and adjusted hotel arrangements accordingly.
Hours later I received a follow-on email that they were not able to book the flight, and when I phoned, was told that they no longer could make bookings with Transportes Aero Regionais and couldnt find flights on Turkish Air. By the end of our conversation I understood that their search and booking processes have no actual connection to the airlines and flights and their availability, but simply constitute a request to the booking agent to seek such flights. Why they would do this, much less represent availability on airlines they can't access under any circumstance, is beyond me. But there it is, and here I am, without a flight, and requesting assistance.
Does anyone know of airlines and flights from Istanbul to Sanliurfa that depart after 5:30 pm? Turkish Airlines has a 20:30 flight that is either fully booked or not flying (I have emailed & spoken with them and still can't quite figure it out). I can't get through to Atlas Air by phone & haven't yet received a response by email. I have also phoned the Sanliurfa airport but my phrase-book Turkish was insufficient to communicate my question to the respondent, who didn't speak English. My travel date is 22 September, and I shall be very grateful for responses.