As I understood it... and Im certainly not 100%
A Water elemental can "hover"... it maintains too much of a physical form to "fly". If confronted with say a cliff... it could step off and "float" down... but it couldnt "fly" across.
I'd guess it could carry very little.. and probably couldnt pull something like a raft. Being made of air and light as air... it would probably be unable to keep hold of things.. having the ghostly " things may pass through it" effect.
Same effect for the Water Elemental.
But I'd wait for wiser minds than mine to confirm or deny this.
