A look at this week's earnings from select airlines:
— Spirit Airlines Inc. said its first-quarter net income tripled to more than $23 million. The low-cost U.S. carrier's ticket revenue fell 6.9 percent to $76. But it made up for that shortfall with fees. Revenue from extras — like carry-on and checked bag fees — rose 21.3 percent to $51.68, or more than $100 for a round-trip flight.
— Lufthansa AG blamed the high price of oil for a first-quarter loss of more than $500 million. The German airline said a 6 percent rise in revenue couldn't overcome higher jet fuel prices.
— Air France-KLM posted a quarterly loss of $483 million as high fuel costs and a drop in cargo volume sliced into earnings. The Franco-Dutch airline's fuel bill rose 18 percent. One bright spot was passenger traffic, which was up 5.5 percent,