What is the best way to get to Carcassonne from the Toulouse airport for 4 senior adults.
To give you an appropriate answer, you should clarify what you mean by "best." Your "best" isn't necessarily the one someone else would choose.
Best = Cheap? Fast? Comfortable? Easy?
you can take a TER (regional train).
Is the TER the "best"?
(There is no TER at Toulouse-Blagnac Airport)
there is a TER at the TLS train station.
it's a train. takes an hour.