Lesson learned, use Priceline only to get price quotes, but never book your reservation through Priceline. I booked a car with AVIS through Priceline. My travel conditions changed so I returned the car one day early. AVIS accepted the early return and directed me to Priceliine for reimbursement of the unused days. Priceline declined to reimburse me for unused days. AVIS told me to call them directly next time instead of going through Priceline and AVIS will honor the price. Had I booked directly with AVIS, I would have been credited for my unused days. So except for price comparison, there is no reason to book anything through Priceline, only to use them as a comparison tool and let the vendor price match.