Ron DeSantis’s affinity for private air travel, regardless of expense or the financial condition of his campaign, was well documented leading up to Monday night’s Iowa caucuses. If DeSantis campaign staffers are indeed moving on to New Hampshire, where the next votes in the Republican primary will be cast Jan. 23, they will find that even commercial airfare will drain precious donor dollars in a major way. Same for staffers of Donald Trump’s other remaining challengers: former South Caroline Gov. Nikki Haley, businessman Vivek Ramaswamy and former Arkansas Gov. Asa Hutchinson. POLL: Should Tru…