South Korea's Air Busan will not allow passengers to keep power banks in luggage stored in overhead cabin bins, in what on Tuesday it called a preemptive measure after one of its planes was engulfed in flames last week.

Hong Kong expert says expansion of measure to other airlines will depend on further risk assessments by trade groups and carriers.

Airlines are bolstering safety measures for lithium-ion batteries after a fire on an Air Busan plane. Passengers are advised to carry power banks instead of storing them overhead.

A local Air Busan source, quoted by JoongAng Ilbo, suggested that a portable battery in a passenger's carry-on luggage might have been compressed, leading to ignition.