As many of you have been claiming since it was first spotted in the trailers for
Deadpool, the final battle between Wade Wilson and Ajax really did take place aboard a Helicarrier. Well, technically. While the piece of artwork below is quite clearly labelled "Helicarrier", it's way too soon to start talking about the Merc with the Mouth hanging out with The Avengers.
io9 actually caught up with artist Emmanuel Shiu, and he told the site that,
"he was asked to redesign the helicarrier so it looked as different as possible from the one in The Avengers. And it had to look like it had been taken apart in some places." So, it was a Helicarrier, but not in an obvious enough way to lead to any sort of dispute between Marvel Studios and Fox!