Flyers could face travel Armageddon over the weekend if the government doesn’t reopen by then, Transportation Sec. Sean Duffy cautioned Tuesday. More than 10% of flights could be delayed nationally, Duffy warned – adding that some airlines may even decide to ground their fleets altogether. “You may find airlines that stop flying. Full stop,” Duffy said. And last weekend’s travel delays – which saw thousands of flights cancelled and scores more delayed – would be “tiddlywinks” compared to what could happen this weekend if the government isn’t open again, Duffy said. “It is going to radically slow down,” the secretary...