NEW YORK, Oct. 1 (UPI) -- Air fare experts say discount fares offered by U.S. airlines are on the rise and may continue to increase.

WASHINGTON, Dec. 16 (UPI) -- The Air Transportation Association said 9 percent fewer U.S. travelers will fly this holiday season, a drop observers say is prompting fare discounts.

STATE COLLEGE, Pa., July 7 (UPI) -- The May 12 earthquake in China's Sichuan province, the region's first in recorded history, has U.S. geologists studying it with an eye to the future.

CHICAGO, July 3 (UPI) -- United Airlines has raised prices at the bar and hopes to raise $1 billion annually from a variety of fees and services, a spokesman for the U.S. company said.

WASHINGTON, May 1 (UPI) -- Leisure travel and extra business trips on U.S. commercial flights could be substantially reduced in the next year, industry analysts report.

FORT WORTH, Texas, April 12 (UPI) -- American Airlines has announced it will raise U.S. fares by as much as $30 on round-trip tickets to help offset rising fuel costs, the company said.

CHICAGO, Sept. 4 (UPI) -- "The world will be on sale" this fall as U.S. airlines scramble to fill seats as the travel market cools, a travel agency executive said.

WASHINGTON, March 19 (UPI) -- Vacationers are cutting their spring breaks short in response to rising travel costs.

DALLAS, Feb. 13 (UPI) -- Low-cost U.S. carrier Southwest Airlines has raised its fares again after raising them six times in 2006, the airline says. The airline's fare hikes of as much as $10 each way were quickly matched by American, Continental, Northwest and other major U.S. a