Yes, mostly 29-inch suitcases are allowed on planes as they usually fall within the size limits for checked luggage set by airlines.
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Measuring the size of your luggage isn't tricky. Most airlines require that your bag be 62 linear inches or less. Therefore, your bag's length, width and height cannot exceed 62 inches. This measurement includes the wheels and the handle of your luggage.
30-inch luggage is one of the largest options, so it's going to weigh more than a 26-inch one or your carry-on. Most airlines have a maximum weight limit of 50 pounds per checked bag. This limit does not take into account size, so 30-inch luggage needs to meet the same requirements as 26-inch luggage.
Large lightweight suitcases (28 -30 inches) usually weigh between 8.5 – 13 pounds (3.9 – 5.9 kg). You can find lightweight suitcases that weigh even less than shown in the above table. You can for example find 30-inch suitcase that weighs only 7.9 pounds (3.6 kilos).
30-inch luggage is one of the largest options, so it's going to weigh more than a 26-inch one or your carry-on. Most airlines have a maximum weight limit of 50 pounds per checked bag. This limit does not take into account size, so 30-inch luggage needs to meet the same requirements as 26-inch luggage.
Yes, you can check a 28-inch suitcase as long as it does not exceed the weight limit set by the airline. In order to be accepted as standard checked luggage the weight should be within the limit of up to 50 or 70 lbs. That being said, some airlines will accept oversized bags up to 126 linear inches (320 cm).
A lot of manufacturers advertise their 28-32 inch suitcases as checked luggage. However, technically, that's false advertising. The truth is that a large portion of 28, 29, 30, 31, and 32-inch suitcases are over the size limits for checked bags, so they can't be used as checked bags.
If your checked bag is over 62 linear inches (157 cm), it will be marked as oversized. This is a rule set by airline regulators to protect baggage handlers from any potential injuries. You'll need to pay a hefty fee for oversized baggage, which usually ranges between 75-200$.
For example, if your bag measures 24 inches long, 18 inches wide, and 20 inches high, its linear inches would be 62 (24+18+20=62). So, when airlines refer to a 62 linear inch limit, they are saying that the combined length, width, and height of your checked luggage cannot exceed 62 inches.
Most domestic airlines anyway have a linear size limit for checked baggage of 62 inches overall, meaning length+width+height. So one length of 32 inches won't put you over the limit if the width and depth keep you under 62 inches total.
For example, if your bag is 24 inches tall, 20 inches long and 18 inches wide, its total linear length is 62 inches. Note that using modern spinner bags, which include four wheels on the bottom of your suitcase, means you'll have less space within your actual bag.