Less flying may mean more profit for the biggest U.S. airlines.

Major carriers are cutting domestic capacity even as travel demand is rising, helping them fill more seats with passengers. That’s sparking optimism AMR Corp.’s American Airlines, UAL Corp.’s United Airlines and others will be able to raise profits and reverse a slide in share prices.

Some airline shares may double within a year because more demand and less supply will allow carriers to charge more for tickets, analysts said. The Bloomberg U.S. Airlines Index has declined 20 percent since Jan. 16 as the price of jet fuel has climbed and average domestic air fares have dropped

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