Thousands of flight cancellations over the weekend have fouled up senior trips for students at several New Jersey high schools. Airlines scrubbed more than 3,500 U.S. flights over the weekend and delayed thousands more, citing weather in Florida and other issues, the Associated Press reported. Gateway Regional High School seniors were supposed to fly out on Spirit Airlines to Orlando on Monday morning to enjoy spring break at Disney World, but the district received word Sunday night that the flight had been canceled, said Principal Jeff Pierro. “Right now, we’re still waiting to hear back on a…