Most of the agencies offering services from the airport only offer a limited mileage policy with each rental (approximately 155 miles per rental). Make sure you find out the exact charges for extra mileage when you arrive to pick up your rental. The companies also typically have a total mileage restriction on the vehicle for the duration of the rental.
Due to laws, insurance coverage and liability, car rental agencies typically restrict you from crossing state or international lines, as well as using ferry services. If you are unsure of whether your itinerary will take you across state borders, ask the car rental desk agent.
Da Nang airport is usually very busy, because it's the third-largest airport in Vietnam, receiving a lot of domestic and international flights. While it can be variable, the busiest times are usually late morning to late afternoon. Try and avoid these times by arriving early in the morning, or later at night.
When you pre-paid for a rental, you need to use the same credit card you used to make the payment, to collect the car. Of course, you also need your driver's licence, an International Driving Permit and a valid ID.
Most popular car type