Military choppers, troop transports and aircraft carriers have all been done as TF alt modes before. Unless you're referring to specific type or class of chopper/transport/carrier which hasn't been done.

I like to explore kinds of alt modes that have never ever been done in Transformers before.

Gutsman Heavy: There was a Walrus Transformer in Beast Wars Neo - only ever appeared as a background character in the show... there was never a toy made of it. That'd be interesting.

...evidently quite attached with that Maximal koala...

Golden Phoenix: A platypus has never been done... heh, the people of England initially thought it was a Fuzor too (i.e.: man-made hoax). Ah, those norti convicts!

Super Car is a term for any high-end sports car - and we've had plenty of those in Transformers before, so that's nothing particularly new.
Autobot Super Car Patrol Team-->