Before I book a redemption back from a trip to GRU where First availability is to be found...can anyone tell me if the 747's used to get there and back are now almost always new first or are there some old firsts still plying that route?

Wouldn't spring for the redemption if old first still gets used on that route once in a while...

I understand there may be the unforeseen replacement but is it generally a NF route please?

Thanks in advance for any advice/help. ^