Whether or not a 20-inch suitcase can be carried on board depends on the baggage policy of each airline. Generally speaking, airlines require that carry-on baggage not exceed 55cm x 40cm x 20cm, and a 20-inch suitcase fits this requirement.
1. However, in addition to the size, the weight of the luggage is also a factor to consider. As a general rule, carry-on baggage should not weigh more than 5-10 kg, and the excess must be checked baggage.
The following are the carry-on baggage allowances of China Southern Airlines:
Maximum number of luggage: 2 pieces for first class and business class; 1 piece in economy class.
Size limit per item: Each carry-on item must not exceed 55 cm (22 in cm (16 in cm (8 in)) in length, width and height
Maximum weight per piece: 8 kg.
Carry-on items exceeding the above weight, number of pieces or size limits should be transported as checked baggage, please check in at the check-in counter or self-service baggage drop-off machine in advance. China Southern Airlines may conduct baggage screening at check-in, security check, boarding gate, and cabin, and the excess baggage will be charged according to the applicable excess baggage charges.
2. In addition, some airlines also have a certain degree of flexibility in the implementation of baggage policies. If the suitcase does not appear to be visually oversized, or if the passenger is not carrying other bulky items, the staff will sometimes let them go.
3. Therefore, when preparing to board, it is recommended to understand the baggage policy of the airline you are taking in advance, and try to choose a suitcase with the size and weight that meets the regulations, so as not to cause unnecessary trouble at the boarding gate.
To sum up, 20-inch suitcases can usually be carried on board if they meet the size and weight restrictions set by the airline. However, in order to ensure a smooth boarding, it is recommended to check the specific policies of the airline in advance and try to comply with them.