Typically, a carry-on bag should not exceed 22 x 14 x 9 inches (inclusive of the handle and wheels). However, the rules can vary by airline. For example, American Airlines' carry-on luggage size ...

Although there may be minor variations of an inch or two between airlines, the standard carry-on luggage size limit is 22 x 14 x 9 inches ... it ensures that your bag—and ideally everyone ...