WASHINGTON, Dec 26 (Reuters) – Weather conditions-connected flight cancellations and delays that snarled U.S. business air site visitors more than the holiday break weekend dragged on by Monday, with Southwest Airways (LUV.N) accounting for the bulk of the lingering disruptions a day soon after Christmas. More than 3,800 U.S. airline flights ended up canceled on Monday, like 2,800 operated by Southwest, or just about 70{5a5867cc9cca71cf546db38f42fbf171004839e3542174405390d177276b4f49} of the carrier’s whole scheduled for the day, according to the flight tracking provider FlightAware. Delays ended up claimed for far more than 7,100 U.S. flight departures and arrivals in general, with several hundred by Southwest. “Challenges are impacting our customers and staff members in…