I just tested twice.
First, I choosed A10c quick mission free flight. I can use "option" to select an airbase(all airbase are grey whatever I change to correct frequency. It's still grey), no reply. And I change frequency to Batumi manually ,then I called "inbound". However, Gudauta response to me and frequency change to 259.000(Gudauta) automatically.
Second,I choosed F14 quick mission free flight,when I call options, it works when I select a correct freuency. But "select""xxx(airbase) still not work.
It makes me confused. XD