The South Korean transport ministry will undertake a safety audit of all the country’s low cost carriers after a door of a plane was found to be leaking air midflight.
A Jin Air Boeing 737-800 jet turned back shortly after take-off from Cebu, Philippines en route to Busan.
"All low-cost carriers will undergo an overall inspection of their safety management to prevent similar accidents," the transport ministry said in a statement.
The plane was carrying 163 passengers some of which complained of loud noise and suffering headaches, local media reported.
"It seems that the noise was caused by wind coming through a small gap in the door, which had not been closed properly. An alarm signaled a problem with air pressure, so we decided to return to Cebu," a Jin Air spokesman said.
The transport ministry added: "We will investigate the maintenance and operation records of the plane. If any regulations were violated, we will fine the airline."
Jin Air is a low cost affiliate of major carrier Korean Air.
