The clear loser has been the airlines. Qantas, Cathay Pacific, we're seeing losses of 5 to 6% here this morning. Jet fuel is one of the largest operating expenses for airlines. A 30% intraday spike in crude oil prices immediately destroys airline profit margins, as these costs cannot be instantly passed on to consumers without causing demand destruction. SHORT. The airline sector will suffer severe margin compression and earnings downgrades as long as oil remains elevated above $100 per barrel. Airlines with aggressive fuel hedging programs may be temporarily insulated from the spot price spike.