These coupons come with an expiry date and hence they must be used well within the validity period. Once the period is over the coupon will not yield any benefits. So to get maximum benefits one should search and collect the coupons and use it well before the expiry date. The benefits got could be just about anything like discount on travel tickets or discounts on shipping of any product. All in all the company aims to provide benefits for its customers so that people can use their products. These codes are very popular with people since it allows them to fulfill their travel plans and that too with a discount.