GENEVA, April 28 : The jet fuel crisis tied to the war in Iran could hit Asia hardest first as a shortage during the peak summer period in the northern hemisphere becomes a growing concern, the head of the International Air ​Transport Association said on Tuesday. The crisis would then impact Europe, followed by Africa and Latin America, Willie Walsh said, with some flight cancellations in order if fuel is rationed.  "I think we will see airlines starting to reduce some of their schedules as we