NEW YORK United States — US carriers will face tough challenges in the months ahead if jet fuel prices stay high, but for now consumers are still booking trips in numbers, airline CEOs said Tuesday. “The 10 biggest booking weeks of our history have been the first 10 weeks of this year,” said United Airlines chief executive Scott Kirby, who described current travel demand as “remarkable.” Robust travel demand represented a bright spot for airlines in presentations Tuesday even as United and it’s two chief rivals, American Airlines and Delta Air Lines, each estimated a $400 million hit to first-quarter […]... Keep on reading: US airlines still see strong demand as jet fuel worries loom