Passengers wait to board at LGA.Robert Nickelsberg/Getty Images US airlines canceled over 1,200 flights from Friday to Sunday over the July 4th holiday weekend. Disruptions eased by Monday afternoon with fewer than 130 flights canceled by major US carriers. Bad weather and staffing issues contributed to the holiday weekend chaos. Travelers can breathe a sigh of relief as flight disruptions ease after a weekend of mass cancelations.Since the start of the July 4th holiday, US airlines have canceled or delayed over 16,500 flights flying within, into, or out of the US, according to data from flight-tracking website FlightAware.