American Pronunciation of Can and Can't

<<Are you from New York?>>

Indeed I am. How did you guess so accurately? Are you superman or something?

The thing is, I've often gotten confused when hearing the response "I can" with the "pad" diphthong, thinking that they were really saying "I can't".

I have to say that I myself am often confused when people pronounce "can't" as ["k_h{~:n] or ["k_hE{~:n], since "can't" normally lacks [n] unless pronounced quite carefully, where then it has [t] either. As a result, people who use such pronunciations of "can't" sound like they are saying "can".

<<No (I wish). It's just that New York and Philadelphia are the only parts of North America I can think of that have a diphthong for some TRAP words, but not in 'can'.>>

"can" actually has two pronunciations for me. "Can" meaning "able to" has a short "a", whereas "can" meaning the container has a diphthong. So, in the sentence "Can I have a can of soda?" the two "can"s are pronounced differently.

I meant to say "since 'can't' normally lacks [n] here" above.

I pronounce "can" as [ka~] and "can't" as [kja:~].

<<Are from the Caribbean?>>

Yes. Specifically Jamaica.

<<Is there any difference in intonation between those words?>>

Yes.

What about "don't"? I have [o:~]. The /d/ totally disappears.