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These appear to be 'improved' versions of the one that we saw in the 2012 Avengers movie in that the four side fans appear to be fixed in place. No more raisng/lowering the side fans when the ship is in the ocean. Deck layout still appears to be the same. Top angle flight deck is for landing and the lower, straight deck is for take-offs. These new Helicarriers also appear to show some extra power for lifting off. Repusor (ala Ironman) technology?
Background information is that Tony Stark/Stark Industries built the huge flying ships for the extra-governmental intelligence and defense agency known as S.H.I.E.L.D. (Strategic Homeland Intervention, Enforcement and Logistics Division).
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Ref.
1. Marvel Movies wikia website. (http://marvel-movies.wikia.com/wiki/File:Helicarriers.png).
2. image (original helicarrier) (http://marvel.wikia.com/S.H.I.E.L.D._Helicarrier).
3. image of hull # 64(from The Avengers) (http://marvel-movies.wikia.com/wiki/File:S.H.I.E.L.D.Helicarrier.jpg).
4. image, control deck of hull# 64. (http://marvel-movies.wikia.com/wiki/The_Avengers_(film)/Gallery).
5. WIRED article. "Physics of the New SHIELD Helicarrier" by Rhett Allain. October 29, 2013. (http://www.wired.com/wiredscience/2013/10/physics-of-the-new-shield-helicarrier/). And previous article dated 07/09/2012 (http://www.wired.com/wiredscience/2012/07/could-s-h-i-e-l-d-helicarrier-fly/).
6. Helicarrier takes a Nosedive! (http://www.movieweb.com/news/6-things-we-cant-wait-to-see-in-captain-america-the-winter-soldier).
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