Although carry-on limits and specifications vary from airline to airline, a full-size suitcase is too large to qualify as a carry-on item. For example, Southwest Airlines requires that carry-on suitcases be no larger than 10 inches in height by 16 inches in width by 24 inches in length.
Delta Airlines specifies that carry-on items must measure less than 9 inches in height, 14 inches in width and 22 inches in length. Individuals should check with the airline they are flying with to determine their specific restrictions.
Many airlines permit a single personal item in conjunction with a carry-on. Purses, laptop bags and diaper bags are examples of eligible personal items. Some airlines have restrictions on the size of personal items.