United States

www.businessinsider.com Most people don't realize this Delta credit card comes with an annual companion plane ticket — it can be an incredible value if you use it right

When you have the Platinum Delta SkyMiles® credit card from American Express, you'll earn a free companion pass each year when you renew the card. The companion pass or certificate is a buy-one-get-one coupon for domestic main-cabin tickets. This can more than make up for the card's annual fee.