NEW YORK -- Flight delays piled up across the country Monday as thousands of air traffic controllers began taking unpaid days off because of federal budget cuts, providing the most visible impact yet of Congress and the White House's failure to agree on a long-term deficit-reduction plan.But several airports - including Dallas/Fort Worth Airport and Dallas Love Field - reported no major impact.The Federal Aviation Administration kept planes on the ground because there weren't enough controllers to monitor some busy air corridors. Cascading delays held up flights at some of nation's busiest airports, including New York, Baltimore and Washington. Many operations were more than two hours behind schedule.At one point, the delays were so bad that passengers on several Washington-New York shuttle flights could have reached their destination faster by taking the train.Nearly a third of flights at New York's LaGuardia airport scheduled to take off before 3 p.m. were delayed 15 minutes or more, according to flight-tracking service FlightAware. Last Monday, just 6 percent of LaGuardia's flights were delayed.The situation was similar at Washington's Reagan National Airport, in Newark, N.J., and in Philadelphia, with roughly 20 percent of flights delayed.At airports, Monday is typically one of the busiest days, when many high-paying business travelers depart for a week on the road. The FAA's controller cuts -- a 10 percent reduction of its staff -- went into effect Sunday. The full force was not felt until Monday morning.Travel writer Tim Leffel had just boarded a US Airways plane from Charlotte, N.C., to Tampa, when the flight crew had an announcement."They said: 'The weather's fine, but there aren't enough air traffic controllers,'" Leffel said. Passengers were asked to head back into the terminal. "People were just kind of rolling their eyes."His flight landed one hour and 13 minutes late.One thing working in fliers' favor Monday was relatively good weather at most major airports. A few wind gusts in New York, snow in Denver and thunderstorms in Miami added to some delays, but generally there were clear skies and no major storms.However, the furloughs will continue for months, raising the risk of a tough summer travel season.There's no way for passengers to tell in advance which airport or flights will experience delays.FAA officials have said they have no choice but to furlough all 47,000 agency employees -- including nearly 15,000 controllers -- because the agency's budget is dominated by salaries. Each employee will lose one day of work every other week. The FAA has said that planes will have to take off and land less frequently, so as not to overload the remaining controllers on duty.Finger-pointingCritics have said the FAA could reduce its budget in other spots that wouldn't delay travelers."There's a lot finger-pointing going on, but the simple truth is that it is Congress's job to fix this," said Rep. Rick Larsen, a Washington Democrat and member of the House aviation panel. "Flight delays are just the latest example of how the sequester is damaging the economy and hurting families across the country."Some travel groups say disruptions could hurt the economy. "If these disruptions unfold as predicted, business travelers will stay home, severely impacting not only the travel industry but the economy overall," the Global Business Travel Association warned the head of the FAA in a letter Friday.Deborah Seymour was one of the first fliers to face the headaches. She was supposed to fly Sunday night from Los Angles to Tucson, Ariz. First her 9:55 p.m. flight was delayed for four hours. Then at 2 a.m., Southwest Airlines canceled it."It's pretty discouraging that Congress can't get it together, and now it's reached the point that we can't get on an airplane and fly," Seymour said.North Texas impactThe FAA said it does not expect Dallas/Fort Worth Airport or Dallas Love Field to experience serious delays on a daily basis, an agency spokesman said on Monday."Depending on the time of day, the weather and traffic conditions at other airports, it's possible that delays still could affect flight schedules," FAA spokesman Lynn Lunsford said in an email statement on Monday.American Airlines spokesman Matt Miller said the airline and its regional carrier, American Eagle, were not experiencing any operational issues because of the furloughs. Delays at the carrier on Monday were caused by weather or other airport issues such as runway construction.According to FlightStats.com, there were 3,800 delays in the U.S. on Monday, with the most out of LaGuardia. DFW Airport had 117 delayed departures, many caused by airports on the East Coast.The FAA said there were about 400 delays Sunday that were attributable to the furloughs.Meanwhile, on some routes Monday, it was actually faster to take ground transportation. The 8 a.m. US Airways shuttle from Washington to New York pushed back from the gate six minutes early but didn't take off until almost 10 a.m.The plane landed at 10:48 a.m. -- more than 2.5 hours late. If travelers instead took Amtrak's 8 a.m. Acela Express train from Washington, they arrived in New York at 10:42 a.m. -- four minutes early.Star-Telegram staff writer Andrea Ahles contributed to this report.