Carcassonne Airport Car Hire
There are all the major car hire companies at the Carcassonne Airport. They are Ada (04.68.11.71 92), Avis (04.68.25.05.84), Europcar (04.68.71.05.98), Hertz (04.68.71.00.55) and LOV Location (04.68.11.74.10). The car hire desks are in the airport and as the airport is small can’t be missed.
It looks like Alamo and National now also have desks at the airport.
You can hire directly with one of the companies above or go thru a consolidator like Auto Europe. If you are travelling for more than 17 days you might try the 'Buy Back Car' with Peugeot, as this scheme can work out to be less than a traditional car hire.