Per the recent question Should Aviation.SE allow answers posted in comments? and general SE policy, answers to the question are not supposed to be answered in comments.

However, as Jamiec's answer to that question mentions, sometimes users drop bits of relevant information that might be useful starting points for a full answer or which might otherwise aid the construction of a full answer, but are not full answers of themselves. Sometimes this is because the user posting that information might not know the full answer to the question, while other times it could just be a matter of the user not having time to write up a full answer.

Should we allow these comments with relevant information that are not full answers to remain on the question or should they be deleted as answers in comments?

If they should be allowed, where should we draw the line between these and answers in comments?