Officials believe have strong currents underwater wreck moves
Part of the tail was found by AirAsia flight crashed QZ8501 in the Java Sea, Indonesia, say the researchers.
The tail is the "black boxes" - the voice and flight data recorders - could give investigators clues to the cause of the accident.
It was found in a secondary search box, giving weight to theories that have strong currents debris moves.
The aircraft was lost on the way to Surabaya, Indonesia on December 28 in Singapore with 162 people on board.
Found no survivors.
Buried in the mud
Part of the tail of the Airbus A320-200 was by teams with divers and underwater vehicles unmanned search and rescue chief Bambang Soelistyo said in Jakarta overview.
This is the first important piece of debris is identified by the accident and was in an area about 30 kilometers (19 miles) found by the first search area.
It was part of the mark on AirAsia Soelistyo said. It is located in the mud buried 30m in water (98ft) deep and is considered backwards.
Despite strong ocean currents and murky water, the researchers were able to take photos, he said. On a sheet, the letter A appears to be deleted.
Only 40 bodies were found, but authorities believe that most passengers are still attached to the inside of the main body of the aircraft.
The hunt continues, a Russian researcher examines Java Sea with binoculars from a Super Puma helicopter
Strong winds and big waves have hampered the work of researchers
The BBC's Karishma Vaswani in Jakarta, the tail does not say in the area of search parties previously focused on, but in the extended search area. This could add weight to this theory, she adds.
A huge international cooperation with antenna searches and more than 30 ships were involved repeatedly hampered by bad weather
"The seas were not very friendly, but the black boxes have a life of 30 days, and they will be able to find them," Peter Marosszeky, Senior Research Fellow of aviation at the University of New South Wales in Sydney compared to Reuters news agency.
"This is the time, which caused the delay."
Some debris, including seats and a door that was found floating in the water.
The weekend sonar research managers detected what they thought were five major sections of the aircraft.
The cause of the accident is not known, but the aircraft was flying in stormy weather at the time and had asked permission to change course.
Seat of the plane crashed was delivered Wednesday in Surabaya
The Indonesian Navy on the debris of the plane crash handed back as far as to transport safety investigators on Wednesday
The victim identification process continues: the transfer of the coffins numbered Indonesian staff in Surabaya
Indonesian aviation officials have said that AirAsia had no permission to use the Surabaya-Singapore route to fly on the day of the accident.
So far 40 bodies of the victims were recovered
Fortieth body
Investigators said they found another body Wednesday, bringing the total to date back to the 40th
Most people on the plane were Indonesian: 137 adult passengers, 17 children and a baby, with two pilots and five of the occupation.
Castilani Anton, head of the Indonesian section of the victims of the disaster, the identification would be more difficult, because the body is discovered by disintegration.
"This makes it difficult to quickly identify the corpses do," he said, quoted by the Straits Times. "We can not do DNA testing, but it takes one to two weeks."
After two weeks, most sink corpses, he was quoted as saying by the Associated Press news.
AirAsia already an excellent safety record, with no fatal accidents involving its aircraft.
AirAsia CEO Tony Fernandes said on Twitter: "We have to find all the pieces quickly, so we all our customers to be able to relieve the pain of our families who are still in first place.".
AirAsia QZ8501: Tail of crashed plane found
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