Service Guarantee Our commitment to prompt customer service is a top priority to you, our valued customer. Once you have been contacted by our reservation's department to confirm your reservation request, your car is GUARANTEED to be waiting for you upon arrival. Online reservations must be made no less than 12 hours in advance of the pickup time with a valid credit card. Executive Airport Service will issue a $20.00 instant credit if we don't meet our service guarantee. This amount will be deducted from your total bill.