Here are some options:
You're going tomorrow on the 11:30 flight, right?
You're going tomorrow on the 11:30 flight, is that right?
You're going tomorrow on the 11:30 flight, correct?
You're going tomorrow on the 11:30 flight, aren’t you?
Here are a couple subtleties:
Phrasing the last question in the negative indicates that you expect a positive answer (confirmation). That is, “aren’t you?” implies that you expect that the person is going on the 11:30 flight. However, this doesn’t apply to questions that are just forms of “right?”.
In “Is that right?”, stress indicates whether you expect a positive or negative answer. “Is that right?” indicates that you expect a positive answer. “Is that right?” and “Is that right?” indicate surprise or doubt.
You're going tomorrow on the 11:30 flight, yes?
This works, but can make you sound like a foreigner:
You're going tomorrow on the 11:30 flight, no?
Here are some more options, which might be perceived as more formal or in some way accusing or challenging the other person, though they can also be used neutrally, depending on your intonation. (Even the very typical options above can be made to sound challenging with the right intonation.)
You're going tomorrow on the 11:30 flight, is that not right?
You're going tomorrow on the 11:30 flight, is that not correct?
You're going tomorrow on the 11:30 flight, is that so?
You're going tomorrow on the 11:30 flight, is that not so?
You're going tomorrow on the 11:30 flight, are you?
You're going tomorrow on the 11:30 flight, true?
You're going tomorrow on the 11:30 flight, is that not true?
You're going tomorrow on the 11:30 flight, is this right?
You're going tomorrow on the 11:30 flight, is this not right?
You're going tomorrow on the 11:30 flight, is this so?
You're going tomorrow on the 11:30 flight, is this not so?
And here are some other ways to ask for expected confirmation, which are familiar and commonplace but convey a distinctive emotional attitude toward the expectation:
You're not going tomorrow on the 11:30 flight, are you?
You're really going tomorrow on the 11:30 flight?
Are you really going tomorrow on the 11:30 flight?
You're going tomorrow on the 11:30 flight—are you kidding?
You're going tomorrow on the 11:30 flight—are you joking?
You're going tomorrow on the 11:30 flight—are you serious?
To get a feeling for how all the various alternative forms affect the tone, you’ll just have to notice the contexts and intonation when people use them. If you're a beginner and want to play it completely safe, just use the four at the top of this message.
Notice that “that” is the most ordinary way to refer to the proposition. “This” also refers to the proposition but sounds formal. However, “it” would normally refer to something else, and it sounds clumsy or mistaken to use it to refer to the proposition in question (“You’re going on the 11:30 flight, is it right?”), at least in American English.
This is actually a rather simple answer although it's rarely explained in simple terms:
What seeks the answer from an undefined set while which asks you to choose among possible options. (Additionally, you could ask which when discussing people.)
For instance, to use your first example, let's say that I was making an appointment with a friend:
"What day are we meeting?"
"I'm available on Tuesdays and Thursdays."
"Which one works best for you?"
Best Answer
I don't think "Am I correct?" is. Correctness is something all-encompassing.
To "be right" is less than that, sometimes you're right sometimes you're wrong.
Correctness applies to a mathematical solution, result or proof and as such is absolute. You wouldn't say: "The solution is right."
But you can ask: "Am I correct in assuming.." or, of course "Is this/my solution correct?".
Which more or less is how your question reads now. Good..