Mesa Airline Basic Indoctrination (BI) Practice Exam

What is the maximum linear inches allowed for a piece of carry-on baggage?

45 inches 50 inches 40 inches 60 inches

Correct Answer:

45 inches

Explanation:

Linear inches is the total of a bag’s exterior dimensions: length plus width plus height. For carry-on baggage, airlines typically cap this total at about 45 inches, with a common size example being 22 by 14 by 9 inches (22 + 14 + 9 = 45). So the largest carry-on that can pass this standard is 45 linear inches. Bags totaling 50 or 60 inches would usually be rejected at the gate, while a 40-inch bag is within the limit but not the maximum.

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