The biggest airline by international traffic, Emirates Airline has said more carriers will suffer in 2012, as fuel costs and sluggish economies undermine profitability, Reuters has reported. "We can reel off a whole load of airlines that are teetering on the brink or are really gone," Tim Clark, the carrier's president, said. "Roll this forward to Christmas, another eight or nine months, and we're going to see this industry in serious trouble."