http://www.nationalcar.com/index.do?action=corpEnroll.do&contractId=5004279&enrollmentType=1&footer=2&header=2&source=blank.gif&sourceCode=9998Benefits include bypassing check-in line, choosing your preferred car from whatever is available in the Emerald Club section of the lot, and other benefits listed on the National Car website.
Open to Anyone
Contract ID 5000304 is for Wal-Mart customers (in other words, anyone) and provides up to 20% off.
Contract ID 5504966 appears on the Wal-Mart edition of the Rand-McNally Atlas. No proof of purchase needed.
Contract ID 3715444 is reportedly for readers of Car & Driver magazine.
Contract ID NCRLESS is sometimes worth a try. This is an ongoing Internet promotion at National and is typically good for rentals within the next couple of months.
Requires Membership
AAA members can use Contract ID 6100253. Be sure to bring your AAA membership card with you.
AARP (up to 30% off) for members only (you must be 50 or older). See the AARP web site for the ID number.
AirTran Airways Contract ID is 6600422 - you may need to belong to this airline's frequent flyer program to qualify, but it's free to join.
Alaska Airlines Contract ID is 5004076 - you must belong to this airline's frequent flyer program to qualify, but it's free to join.
American Airlines Contract ID is 5036929 - you must belong to this airline's frequent flyer program to qualify, but it's free to join.
Continental Airlines Contract ID is 5007160 - you must belong to this airline's frequent flyer program to qualify, but it's free to join.
Delta Airlines Contract ID is 5000302 - you must belong to this airline's frequent flyer program to qualify, but it's free to join.
Emerald Club members can use Contract ID 5007125.
Entertainment Book owners get a special Contract ID that frequently provides excellent discounts on the base rate and can be combined with the very good coupons also included in the book.
Northwest Airlines Contract ID is 5037153 - you must belong to this airline's frequent flyer program to qualify, but it's free to join.
United Airlines Contract ID is 2700075 - you must belong to this airline's frequent flyer program to qualify, but it's free to join.
Visa Card International Contract ID is 8572987. This is a great ID because it is valid internationally and in addition to providing up to a 20% a discount on your base rate, it includes many fees that can add to the cost of your rental. For instance, on an Orlando rental I found it covered the Loss Damage Waiver, Supplemental Liability Insurance, Concession Fee Recovery Charge, Florida Surcharge, Tire/Battery Fee and License Recoupment Fee. Reservations must be made in advance and are subject to availability. Certain blackout dates may apply. Discount may not be combined with any other discounted or promotional rate. National Car Rental’s standard terms and conditions of rental from the renting country plus driver and insurance qualifications apply. Offer available only to Visa cardholders when paying with their Visa card at time of rental.