To get to the airport take a taxi from the center for around 10 US dollars. Alternatively take the local direct express bus 121 to the airport from the bus station.
Both Hertz and Avis have rental facilites at the airport, but check hours as they are not always there. There is an shop and convenience store/bakery that sells overpriced coffee, among other things.
Flights to/from Tucuman
Lan and Aerolineas Argentinas/Austral have daily flights to and from Aeroparque airport in Buenos Aires (2 hours). Sol airlines flies to Cordoba, and then on to Mendoza. To view flights to Tucuman from Buenos Aires, submit the form on the left side of this page.