TITLE: Why are two planes parallel to the same line not necessarily parallel?
QUESTION [22 upvotes]: What is a case in which the statement, "Two planes parallel to the same line are parallel" be false?

REPLY [2 votes]: The answer to Why are two planes parallel to the same line not necessarily parallel? is: because for every two planes there is a line parallel to both of them, so if the two planes parallel to the line had to be parallel, every two planes would be parallel, which implies all planes would be parallel. Which is false.