How Jack Sheldon turned his free Jack’s Flight Club newsletter into a money-making business

Turning a digital hobby into a money-making business has flummoxed many. Jack’s Flight Club has made it work by offering paid-for supplements on top of a free service. Jack Sheldon has a talent for finding the cheapest flights. Thousands of his newsletter subscribers would attest he’s better at it than even famous sites like Skyscanner and Expedia. Sheldon is a …