The word “aunt” has two correct pronunciations in AmE: ANT (like the insect) and AHNT.
Both pronunciations are given, in that order, in The American Heritage Dictionary of the English Language (4th ed.) and Merriam-Webster’s Collegiate Dictionary (11th ed.).
The first (ANT) is by far the predominant American pronunciation. The second (AHNT) is common in the Northeast, some Southern dialects, and among African Americans.