For a man the trailers have consistently pointed out usually works alone, Batman sure does have a giant plane to put his nonexistent friends in.
Image: WB/DC via Entertainment Weekly
This new plane is called the Flying Fox, a name that caused some confusion before one colleague dredged up a memory that the Flying Fox is a type of bat. How esoteric, yet still thematically appropriate of you, Bruce. And, as befits the size of this thing, Wikipedia informs us that "The large flying fox is among the largest species of bat". Well played, again.
Just how big is this thing? Well, production designer Patrick Tatopoulos told EW that "You can put three Batmobiles in the lower part of it". The bottom of the plane is the cargo deck — presumably for the three Batmobiles — while there's a "cultural center" with computers on the second floor and cockpit on the third. It's also apparently some sort of panopticon, since Tatopoulos added, "Whatever floor you are on, you can see [the other] two stories."
You know, for any other superhero, you might laugh at the absurdity. But part of Batman's schtick is how truly insanely prepared he is for every possible event. I bet he has a dozen of these, just in case.