SINGAPORE – The war waged by the United States and Israel on Iran has left travellers increasingly uncertain about planning holidays. As the conflict enters its seventh week with a tenuous ceasefire agreement and a looming blockade on Iranian ports, its impact on industries such as aviation, energy and shipping continues to ripple outwards. Oil prices have surged – with reports pointing to a 30 to 40 per cent increase from pre-war levels – prompting some airlines to introduce fuel surcharges. Some Asian airlines, including Vietnam Airlines and Batik Air Malaysia, have begun slashing flights to shield from the impact…