The J1 summer work visa to the US was the product that made Usit, the travel brand now serving its third generation of Irish students. But Usit’s reliance on providing this key to the American rite of passage for thousands of young people has also been its main weakness through two insolvencies over the past decade. Now that J1 visas are back after a two-year pandemic suspension, they are posing a fresh challenge to the latest iteration of Usit. This time, the business is simply struggling to meet demand. In the past week, The Currency has spoken with two families…