Shin (@hey_itsmyturn) said on September 28 that a previously unconfirmed report about the cancellation of flights from Iran to Turkey appeared to be correct.

Shin wrote:

Seems like the report I got was correct.
Flights from Iran to Turkey will be halted in early October.

The update quoted Shin’s September 27 post, which had characterized the information as unconfirmed RUMINT:

I received a RUMINT regarding the cancellation of all the Iranian flights from Iran to Turkey from the beginning of October.
Can't confirm yet.