There is a computer error. Many rental agencies do offer car accessories such as child seats, ski racks, tape players, etc. Yes you can, however, some modifications may cause rate changes. Car rates can change daily, even hourly, so any changes you make to your reservation after it is confirmed will affect the rate at which it is reserved. No, taxes and insurance are not included.
Many rental agencies do offer shuttle service.
You will need to ask about this at the pickup desk. This depends upon availability at the time of arrival. We cannot guarantee car model or make. The price of the tickets include taxes and fees which are imposed on air transportation by government authorities. Unfortunately tickets are NOT refundable or transferable.