X be the number of
kgs that a passenger is allowed to check-in based on class of traveler. It would be fair to assume that, not every passenger would carry exactly that weight baggage. It maybe slightly lesser. However, when you sum up all these small differences, the overall difference may not be so trivial.
What do the airlines do about this? What are the statistics around this - i.e., how close are airlines in reaching the limit of
X kgs? Is there any way, airlines monetise this at the last minute?