The World Cup in Brazil gave airline traffic figures for International Airlines Group, the holding company for British Airways and Iberia, a kick-start during June.Group premium traffic, across the two airlines' business and first-class passengers, increased 4.0% in revenue passenger kilometres compared to the same month last year.May's premium traffic figures showed a 9.7% rise, while April saw a 4% improvement. Overall group traffic for June, including standard fares and the budget Vueling brand, lifted 5.9% compared to the previous year.Group capacity measured in available seat kilometres rose by 8.5%.Shares in IAG were down 0.16% to 365p by 16:00. OH