Is "aren't I" correct grammar?
Solution 1:
The NOAD reports that aren't is the contraction of are not, and am not; in the latter case, it is used only in questions.
Why aren't I being given a pay raise?
The Collins English Dictionary says the same, but it says that using aren't as contraction of am not is informal, and chiefly British.
- informal, mainly British (used in interrogative sentences)
am not
Solution 2:
Aren't I? is standard English as the negative interrogative of I am. So it is correct.
Ain't I? is also common though regarded as a lower register. Am I not? sounds far too picky. I am, init? is also used, though I hate it. Amn't I might be logical, but only seems to exist, if at all, in Scottish or Irish dialect.