Instead of three stories, I think it was the same story told from different perspective. Because you would watch at some points, the same event from the air and sea perspective. It this it was what made it interesting for me.
Other point that I liked was that the movies didn't focused on the characters. but on the event. Because, I didn't want to watch another war movie where the characters talk in the middle of the fight about their life back home.
I wrote a small review about the movie as well.