The airplane noises drown out the dialogue far too much for my tastes.
I loved the book, probably my favorite novel if I had a gun to my head and had to pick one, so I decided to watch the movie...
Now, believe it or not, but in my head, while reading the book, I didn't hear the drone of the planes, and in my head, I could hear the characters speaking clearly.
"I'm cold.. I'm cold."
You can't have narration as poignant as "The grim secret Snowden had spilled all over the messy floor. It was easy to read the message in his entrails. Man was matter, that was Snowden’s secret. The spirit gone, man is garbage. That was Snowden’s secret." in a movie. There's no textual narrator.
The narrator was half the fun of the book.
The other half was not having airplanes drown out the dialogue.
Still, at least Heller got some money from the movie. He deserved it. Hell of an author, have a lot of respect for the man. He wrote one of the most comedic and moving books about the absurdities and horrors of war.