Customizing your rent a car is also possible with our attractive deals on useful add-ons and upgrades. Extras such as GPS, child seats, additional drivers, coverage packages and more can help you have an optimal driving experience. Include your selected optional features when you book ahead online or over the phone. Please be aware reservations are only guaranteed for the car category and not to receive a specific model. Returning Sixt customers can make use of the express counter of our Frankfurt/Main West location, while all smartphones users can try and reserve the rent a car of their choice with our app shortly before pick up.