AirAsia Flight 8501 vanished Sunday morning in airspace thick with storm clouds on its way from Surabaya, Indonesia, to Singapore. The search expanded Monday, but has yet to find any trace of the Airbus A320.
READ ALSO: Missing AirAsia plane likely 'at bottom of sea', Indonesia Search chief says
"Based on the coordinates that we know, the evaluation would be that any estimated crash position is in the sea, and that the hypothesis is the plane is at the bottom of the sea," Indonesia search and rescue chief Henry Bambang Soelistyo said at a news conference.
The last communication from the cockpit to air traffic control was a request by one of the pilots to increase altitude from 32,000 feet (9,754 meters) to 38,000 feet (11,582 meters) because of the rough weather. Air traffic control was not able to immediately grant the request because another plane was in airspace at 34,000 feet, said Bambang Tjahjono, director of the state-owned company in charge of air-traffic control.
READ ALSO: Q&A — What might have happened to AirAsia jet
By the time clearance could be given, Flight 8501 had disappeared, Tjahjono said. The twin-engine, single-aisle plane, which never sent a distress signal, was last seen on radar four minutes after the last communication from the cockpit.
First Adm Sigit Setiayana, the Naval Aviation Center commander at the Surabaya air force base, said 12 navy ships, five planes, three helicopters and a number of warships were taking part in the search, along with ships and planes from Singapore and Malaysia. The Australian Air Force also sent a search plane.
Searchers had to cope with heavy rain Sunday, but Setiayana said Monday that visibility was good. "God willing, we can find it soon," he told The Associated Press.
The plane's disappearance and suspected crash caps an astonishingly tragic year for air travel in Southeast Asia, and Malaysia in particular. Malaysia-based AirAsia's loss comes on top of the still-unexplained disappearance of Malaysia Airlines Flight 370 in March with 239 people aboard, and the downing of Malaysia Airlines Flight 17 in July over Ukraine, which killed all 298 passengers and crew.
"Until today, we have never lost a life," AirAsia group CEO Tony Fernandes, who founded the low-cost carrier in 2001, told reporters in Jakarta airport. "But I think that any airline CEO who says he can guarantee that his airline is 100 percent safe, is not accurate."
READ ALSO: This is my worst nightmare, AirAsia CEO says
Nearly all the passengers and crew are Indonesians, who are frequent visitors to Singapore, particularly on holidays.
Flight 8501 took off Sunday morning from Surabaya, Indonesia's second-largest city, and was about halfway to Singapore when it vanished from radar. The jet had been airborne for about 42 minutes.
Indonesia, Singapore and Malaysia launched a search operation near Belitung island in the Java Sea. The search area extends 60 kilometers all around the plane's last point of contact.
Sunardi, a forecaster at Indonesia's Meteorology and Geophysics Agency, said dense storm clouds were detected up to 13,400 meters (44,000 feet) in the area at the time.
"There could have been turbulence, lightning and vertical as well as horizontal strong winds within such clouds," said Sunardi, who like many Indonesians uses only one name.
Airline pilots routinely fly around thunderstorms, said John Cox, a former accident investigator. Using on-board radar, flight crews can typically see a storm forming from more than 100 miles away.
In such cases, pilots have plenty of time to find a way around the storm cluster or look for gaps to fly through, he said.
"It's not like you have to make an instantaneous decision," Cox said. Storms can be hundreds of miles long, but "because a jet moves at 8 miles a minute, if you to go 100 miles out of your way, it's not a problem."
Authorities have not said whether they lost only the secondary radar target, which is created by the plane's transponder, or whether the primary radar target, which is created by energy reflected from the plane's body, was lost as well, Cox said.
The plane had an Indonesian captain, Iryanto, who uses one name, and a French co-pilot, five cabin crew members and 155 passengers, including 16 children and one infant, the airline said in a statement. Among the passengers were three South Koreans, a Malaysian, a British national and his 2-year-old Singaporean daughter. The rest were Indonesians.
AirAsia said the captain had more than 20,000 flying hours, of which 6,100 were with AirAsia on the Airbus 320. The first officer had 2,275 flying hours.
"Papa, come home, I still need you," Angela Anggi Ranastianis, the captain's 22-year-old daughter pleaded on her Path page late Sunday, which was widely quoted by Indonesian media. "Bring back my papa. Papa, please come home."
At Iryanto's house in the East Java town of Sidoarjo, neighbors, relatives and friends gathered Monday to pray and recite the Quran to support the distraught family. Their desperate cries were so loud, they could sometimes be heard outside where three LCD televisions had been set up to monitor search developments.
"He is a good man. That's why people here appointed him as our neighborhood chief for the last two years," said Bagianto Djoyonegoro, a friend and neighbor.
Many recalled him as an experienced Air Force pilot who flew F-16 fighter jets before becoming a commercial airline pilot.
The missing aircraft was delivered to AirAsia in October 2008, and the plane had accumulated about 23,000 flight hours during some 13,600 flights, Airbus said in a statement.
The aircraft had last undergone scheduled maintenance on Nov 16, according to AirAsia.
The airline has dominated budget travel in Southeast Asia for years, highlighting its low fares with the slogan, "Now everyone can fly." It flies short routes of just a few hours, connecting the region's large cities. Recently, it has tried to expand into long-distance flying through sister airline AirAsia X.
The A320 family of jets, which includes the A319 and A321, has a good safety record, with just 0.14 fatal accidents per million takeoffs, according to a safety study published by Boeing in August.
Flight 8501 disappeared while at its cruising altitude, which is usually the safest part of a trip. Just 10 percent of fatal crashes from 2004 to 2013 occurred while a plane was in that stage of flight, the safety report said.
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