This example demonstrates asynchronous data loading with D3 v7 by fetching an airline loyalty program CSV from Kaggle and displaying the parsed data as JSON. The visualization initially shows a loading state before `fetch()` retrieves the file and `csvParse` converts it into an array of objects. Numeric fields like Salary, CLV, and enrollment dates are coerced using unary plus operators. The `viz` function manages the render cycle through a state object, updating the displayed data once the loading completes.