International Airlines Group (IAG) posted a significantly higher operating profit in the first quarter and assured investors its full-year result will be better than last year despite rising fuel prices. The airline earned a €280 million ($335.5 million) operating profit in the March quarter, up €120 million over the prior-year quarter. On a group level, IAG reached a 6.9% operating margin. British Airways (BA) continued to be the most profitable unit at a 9.9% margin, followed by ...