Which of the following is NOT a dimension of a personal item allowed by Frontier Airlines?

The dimension of a personal item allowed by Frontier Airlines typically adheres to specific restrictions, which are generally designed to ensure that passengers can carry a small bag that fits comfortably under the seat in front of them. The commonly accepted dimensions for a personal item include 18 inches wide, 14 inches tall, and 8 inches deep.

When considering the dimensions listed, 24 inches long exceeds the permissible size for a personal item. This dimension would not meet the criteria that Frontier Airlines sets, as it is too large to qualify as a personal item. Instead, it represents the size of a larger piece of luggage, which would fall under different guidelines, such as a carry-on bag. Therefore, the correct answer identifies that 24 inches long is not an acceptable dimension for a personal item according to the airline’s policies.