When TPG Senior Writer Ben Smithson alerted me to Air France-KLM Flying Blue's July Promo Reward sale — flights from Denver International Airport (DEN) to Europe started at 15,000 Flying Blue miles each way — I was excited. Deals like this aren't exactly rare, but most of them depart from either the East Coast or West Coast, and I'm based in Colorado. I've considered booking positioning flights to take advantage of past deals, but the cost and hassle never ended up being worth it.