ISTANBUL  Reviewing impacts of the ongoing war in the Middle East, the head of the International Air Transport Association (IATA) said on Tuesday air fares increased related to costs, capacity and margins. Willie Walsh said on Tuesday: "Without knowing the length and intensity of the war in the Middle East, it is impossible to quantify the full impact that it will have on airline prospects. "But some things are already clear. Fuel costs have risen sharply. With tight capacity and thin margins,