A Spirit Airlines pilot whose last flight before retirement was canceled when the budget airline shut down for good became emotional after a rival airline stepped in to celebrate his milestone. Captain Jon Jackson’s retirement flight, a ceremonial final trip to mark the end of his career, was canceled Saturday as Spirit announced it would cease operations immediately after rescue talks with the Trump administration failed. Instead of a celebratory final flight, Jackson headed home as a passenger on Southwest Airlines, alongside his son, Chris, who works as a first officer for the airline. “Chris casually mentioned to the flight’s Pilots that this would have been his dad’s retirement flight,” Southwest Airlines wrote on Facebook . “They seized the opportunity to change the course of the day for Capt.…