I assume ship transfer. If there is no ship transfer on the carrier, then I see no point to them. Since the start, I have assumed they will have some iteration of a shipyard that can do transfers but not buy/sell locally
I've had a foreboding thought .... Shipyards and ship transfer has not been mentioned by Frontier (someone please correct me if they have mentioned it)
AND given Frontier's track record of features aimed at encouraging players to play together (for a given value of "together")
I seriously am starting to think that the Fleet Carriers WON'T have ship transfer. You own one, you dock with it, you manage it from the cockpit of the ship you docked in ....
But putting your other ships on the carrier, NOPE.
Feel free to doubt me and disagree and argue all you want, but it's the sort of thing Frontier would do, introduce a feature and then mess it up royally somehow.
(P.S. Frontier, please feel free to comment and prove me wrong.)
EDIT: I should probably note that "Frontier royally messing it up" is entirely an opinion, and I accept other's and Frontier's opinions will be that Frontier have not messed it up, and that's Ok.