Spirit Airlines announced Sunday it has largely completed refunding passengers and returning crew after its abrupt operational shutdown . Most card refunds were processed by Saturday evening, with a small percentage still pending, the company stated. Around 1,500 crew members were rebased. Other airlines offered discounted rescue fares for stranded travelers. The low-cost airline announced early Saturday morning that it would shut down its operations immediately after 34 years in business, leaving thousands of passengers scrambling to rebook their travel on other airlines. The company, which operated hundreds of daily flights across the U.S. and employed 17,000 people , had been in discussions with the Trump administration about a $500m rescue package, but no deal was reached. But the effort has stalled because Spirit has been unable to secure the necessary backing from bondholders and government stakeholders, people familiar with the matter told the Wall Street Journal on Friday.…