Crack-down on carry-ons:

Nearly every airline’s carry-on policy states that passengers are allowed to board with one personal item, (such as a purse or a laptop bag) and one bag that can be no larger than 45 linear inches, which is the total of the height, width and depth of the bag. Few travelers know if their carry-on bag actually meets the 45 linear-inches limit. Given the outrageously large bags we’ve all seen some folks trying to stuff into the overhead bins, fewer travelers seem to care.

But they’re going to have to. Travelers hoping to avoid the new checked-bag fees simply by taking oversized bags onboard could find themselves sent back to the check-in counter by airline employees monitoring bag sizes.