German entrepreneur says he is 200 miles into a 100 million air mile target . Scheme involves buying gift cards with air mile - linked credit cards , and immediately liquidating the company . Only researched for United Airlines so far , but is good for first class flights on various airlines .
German entrepreneur says he is 150,000 miles into a 1 million air mile target . Scheme involves buying gift cards with air mile-linked credit cards , and immediately liquidating the cash . Only researched for United States so far , but is good for first class flights on various airlines .