Lengthy airline delays are twice as common now as in 1990 and will get worse as the economy recovers, according to a Brookings Institution report released Thursday.
The researchers said much of the problem is due to heavy concentrations of short trips between big cities, but they also cited an "ill-equipped" air traffic control system and other factors.
They suggested increasing high-speed rail service to offer travelers alternatives to short flights. They also recommended letting busy airports charge fees on rush-hour flights to make airlines spread trips more evenly through the day.
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