agree with all of the above.
Remember, that when you give a weakness or two, be prepared to acknowledge it.
What i mean by that is: you know what it is, are aware of it and am conscious about not making it a factor i making decisions.
This is irrelevant of an airline interview and pretty generic.
Any HR department who knows thier potatoes will use, what is called a 'structured interview technique (usually).
This means that whatever answer you give to a quaestion like this, they will want to know a SPECIFIC example. If you cannot give this, the perception is of BS.
Pick your weaknesses before the interview and think of a situation where you made sure it did not influence an evenit, incident etc.
Purely because it's hard to think of those things at a moments notice.
Good luck at the interview, if that is why you are posting the question on the forum