Both American Airlines and Southwest Airlines saw significant cancelations over the weekend, according to flight-tracking websites, although both carriers said the cancelations were due to weather and staffing issues. American Airlines, as of Sunday at 1 p.m., saw 735 cancelations—27 percent of its flights—and 164 delays, according to FlightAware. The tracking website also showed that on Sunday, Southwest canceled 187 flights, or 7 percent of all its flights, and delayed 280 more—about 10 percent of its flights. American Airlines was forced to cancel about 1,000 more on Friday and Saturday, the tracking website’s data shows. Southwest hasn’t experienced the same number of cancelations, but the Dallas-based carrier scrapped about 2,000 flights earlier in October, leading to $75 million in losses. Southwest said in a statement the “delays were a result of the severe weather across parts of the country which you’ll notice on Friday’s weather map … including heavy rain, …