Reserve your rental car at continental.com and pay with your Continental Airlines credit or debit card to earn miles for your qualifying purchases. You’ll also receive special OnePass discounts.
http://www.continental.com/web/en-US/content/reservations/car.aspx
Terms and Conditions
Mileage earnings and redemption are subject to the OnePass terms and conditions set forth in the OnePass Frequent Flyer section of continental.com. Additional restrictions to this offer apply.