The Brief More than 320 flights were delayed and over 220 were canceled at Philadelphia International Airport on Tuesday, July 28. Severe storms and technical issues led to hundreds of flight delays and cancellations at Philadelphia International Airport on Tuesday, July 28, according to flight-tracking website FlightAware. According to FlightAware, more than 320 flights were delayed and more than 220 were canceled at Philadelphia International Airport. The TSA checkpoint was mostly empty, but the American Airlines special services counter had a long line as travelers tried to rebook. What we don't know:It is not clear when normal operations will resume at Philadelphia International Airport or how long travelers will continue to face delays and cancellations.