According to a source who spoke with Indie Revolver, Warner Bros spent $5 million to purchase a vintage World War II aircraft (the report mention it might be a German Luftwaffe) for Dunkirk that will be equipped with IMAX cameras.
However, what comes as a surprise is that Nolan might not be sparing the dollars to pull off a stunt with a real World War II plane that will end in fiery glory.
All this being said, destroying a World War II aircraft seems excessive for simply shooting a few Dunkirk sequences.
Having concluded his Batman trilogy with The Dark Knight Rises and taken astronauts to another galaxy in Interstellar, Christopher Nolans next directorial, feature-length project is winding the clock back to World War II for Dunkirk.