Pangkalan Bun, Indonesia: Recovery teams have found the tail of the crashed AirAsia Flight 8501 in the Java Sea, the Indonesian search chief said Wednesday, the eleventh day of relief operations.

"We have successfully obtained part of the plane that has been our target. The tail portion has been confirmed found," search and rescue agency chief Bambang Soelistyo told reporters in Jakarta.

The discovery on the seabed could mark a breakthrough in the search as the tail of a plane usually houses the "black box" flight data recorders, crucial to determining the cause of a crash.

Read: AirAsia tragedy: 5th object found from jet crash, says Indonesia rescue chief

The plane vanished from radar screens during a storm on December 28 when it was flying from the city of Surabaya to Singapore with 162 people on board, most of them Indonesian.

Despite a huge recovery operation assisted by various countries, progress has been patchy with poor weather conditions hampering the search. So far 39 bodies have been found, all of them floating on the sea.

Read: May take a week to recover AirAsia jet black box: Indonesian official

Search chiefs earlier said five large parts of the plane had been detected but had not confirmed which parts of the aircraft.

Indonesia alleges the plane was flying on an unauthorised schedule when it crashed and AirAsia has since been suspended from flying the Surabaya-Singapore route.

The plane was flying from Surabaya, Indonesia's second-largest city, and was about halfway to its destination, Singapore, when it vanished from radar. It had 162 passengers and crew onboard.