Starting a separate thread for a completely different question...
It is pretty much a given that all Eldar/Dark Eldar are capable of limited flight, so to speak. At the same time, we know that there are Eldar Corsairs with their own fleets and their own vehicles. Thus here are the two questions...
(1) Do we assume that the Eldar Corsairs do not require additional troop transports ships for their vehicles?
(2) Do all Eldar Corsair vehicles need to depart from their ships within a planet's atmosphere? (The answer is obvious enough for Dark Eldar, so no asking about that.)
This is assuming that the Eldar Corsairs/Dark Eldar are attacking a planet via planetary assault method, so to speak, without webway capabilities for their initial arrival.