I flew last year both airlines. I flew RG
from Rio to Curitiba and back, and I flew TAM from Curitiba to Assuncion and back ( with a 20 minutes stop at Foz do Iguaçu ). In RG
I flew a 737-300 and a 500 ( this one from Nordeste ), with TAM I flew the Fokker F100.
The service on RG
was very standard, a small hot calzone pizza, a cake and a beverage, both flights were quite full taking in mind that those flights headed and came from Florianopolis. The airplanes looked a bit old but clean, although I had flown before on the 737-300 the 500 was a first for me.
TAM was a pleasant surprise. The service was good, we got a light meal on the first half of the flight until Foz do Iguaçu and the plane was full of empty seats on that section of the flight. From Foz do Iguaçu to Assuncion I think the plane got a good load of passengers. The Fokker F100 looked a great airplane for those types of flights, very silent ( the engines on the back help ) and a very flexible platform. Our flights came all way from Buenos Aires and headed to Santiago do Chile, and that really impressed me!!!!
Just for the posterity here it goes the registrations:
Rio/Curitiba - RG
Curitiba/Rio - Nordeste 737-500 PT
Curitiba/Foz do Iguaçu/Assuncion - TAM Fokker F100 PT
Assuncion/Foz do Iguaçu/Cutiriba - TAM Fokker F100 PT