(CNN) – The only reasonable explanation for the crash of a Russian passenger jet in Egypt is “an external influence,” an executive from the airline that operated the flight said Monday, stressing that planes don’t just break apart in midair.
“We exclude technical problems and reject human error,” Alexander Smirnov, an official at the airline, told a news conference as he discussed possible causes of the crash.
The Russian passenger jet that crashed in Egypt had been fully inspected and its crew didn’t communicate any problems during the flight, executives for the airline Kogalymavia told reporters Monday.
The Airbus A321-200 had previously had an accident involving its tail section, but the airline officials said that full-scale repairs had been done and that there was no reason to think that the prior accident had anything to do with the crash Saturday.
The remains of many of the 224 people killed aboard the Russian passenger jet that crashed in Egypt over the weekend have arrived back in St. Petersburg, but uncertainty still surrounds what caused the disaster.
A senior Russian aviation official has said Kogalymavia Flight 9268 broke into pieces in midair before it hit the ground in a remote area of Egypt’s restive Sinai Peninsula on Saturday.
Officials have played down an apparent claim by Islamic militants in Sinai that they brought down the Airbus A321-200, saying technical failure is the most likely reason for the crash.
But so far, they haven’t been able to give a definitive explanation of what happened, with the Egyptian President suggesting investigations could take months.
Here’s where things stand:
Flight 9268 was on its way from the Egyptian resort of Sharm el-Sheikh to St. Petersburg early Saturday when it dropped off radar about 23 minutes into the flight, Egyptian officials say.
Air traffic controllers apparently didn’t receive any distress calls from the pilots. “There was nothing abnormal before the plane crash,” Egyptian Civil Aviation Minister Hossam Kamel said Saturday. “It suddenly disappeared from the radar.”
CNN aviation correspondent Richard Quest said it was “unusual” for an aircraft to go down roughly 20 minutes into a flight.
“At this point, a plane is on autopilot. It’s reaching its initial cruising altitude, and there is little that can or should go wrong,” he wrote in an analysis.
But the website Flightradar24 that tracks aircraft around the world said it had received data from the Russian plane suggesting sharp changes in altitude and a dramatic decrease in ground speed before the signal was lost.
“It’s disturbing to me. It indicates me that something occurred possibly in the way of aerodynamic stall. I mean, an airplane just cannot fly at those lower speeds,” said CNN aviation analyst Les Abend, although he cautioned that the Flightradar information was very preliminary.
“Disintegration of the fuselage took place in the air, and the fragments are scattered around a large area” covering about 20 square kilometers (8 square miles), Viktor Sorochenko, executive director of Russia’s Interstate Aviation Committee, told reporters Sunday.
Learning that the plane broke into pieces while in the air helps reduce the list of possible causes of the crash, but there are still plenty of scenarios, said CNN aviation analyst Peter Goelz.
“It narrows it down a little bit, but there are a number of issues that could have affected this plane,” said Goelz, a former managing director of the U.S. National Transportation Safety Board (NTSB). “And terrorism has not been ruled out.”
He suggested the disaster could have resulted from “some sort of catastrophic failure, perhaps caused by an earlier maintenance problem. It could have been a center fuel tank that might have exploded.”
Former NTSB investigator Alan Diehl told CNN he believes the “final destruction” of the plane could have been due to “aerodynamic forces or some other type of G-forces.”
Investigators are expected to get a clearer idea of what happened to the aircraft from its flight data and cockpit voice recorders — devices commonly known as black boxes — both of which have been recovered, according to authorities.
The Airbus A321-200 operated by the airline Kogalymavia passed a routine inspection before takeoff, Egyptian Airports Co. chief Adel Al-Mahjoob said Saturday.
But the plane’s co-pilot, Sergei Trukhachev, had told his daughter he was concerned about the technical condition of the plane, according to his ex-wife. “Our daughter had a telephone chat with him just before the flight,” Natalya Trukhacheva told Russia’s state-run NTV. “He complained before the flight that one could wish for better technical condition of the plane.”
According to the Aviation Safety Network, which tracks aircraft incidents, the same plane’s tail struck a runway while landing in Cairo in 2001 and required repair. At the time, the aircraft was registered to the Lebanese carrier Middle East Airlines, registration records show.
The plane was built in 1997, and Kogalymavia, which is also known as Metrojet, had been operating it since 2012, Airbus said in a statement. The aircraft had clocked up around 56,000 flight hours over the course of nearly 21,000 flights, the plane maker said.
There were 217 passengers and seven crew members on board Flight 9268. Of the passengers, 209 were Russian, four were Ukrainian and one was Belarussian. The citizenships of three other passengers are unknown.
Twenty-five children were among the victims, including 10-month old Darina Gromova, who is shown in a photo posted on social media by her mother on October 15 at the start of the family’s trip to Egypt. In the photo, Darina is looking out a window at planes on the tarmac of Pulkovo Airport in St. Petersburg.
Russian media reported that the disaster created a large number of orphans in Russia, as a lot of parents left their young children with relatives while they took vacation in Sharm el-Sheikh.
Early Monday, a Russian plane carrying the remains of 144 of the crash victims landed in St. Petersburg, Russia’s state-run news agency RIA Novosti reported.
Another plane bringing more bodies is expected to depart Egypt later Monday.
Egyptian President Abdel Fattah el-Sisi on Sunday urged the public not to jump to conclusions. “These are complicated matters that require advanced technologies and wide investigations that might go on for months,” he said.
Sisi has promised Putin to allow “the broadest possible participation of Russian experts in the investigation,” according to the Kremlin, and Russian officials have joined their Egyptian counterparts at the crash scene. Putin has also ordered Russian Prime Minister Dmitry Medvedev to open an investigation into the crash, the Kremlin said.
Aviation investigators from France and Germany, the countries where the plane was manufactured, are also taking part in the inquiry.
Egyptian officials said Saturday that the two black boxes were being transported to Cairo for analysis.
The flight data recorder stores a vast array of information about the flight, such as air speed, altitude, engine performance and wing positions. The cockpit voice recorder captures sounds on the flight deck that can include conversations between the pilots and warning noises from the aircraft.
It wasn’t clear when any information obtained from the devices would be made public.
In recent years, the Sinai Peninsula has been a battleground between ISIS-affiliated militants and Egyptian security forces. The vicious conflict has killed hundreds of people.
The militants appeared to claim responsibility for bringing down the Russian passenger jet in a statement posted online Saturday, but officials in Egypt and Russia disputed it.
Mahjoob, the airport official, said there was no evidence of a terrorist attack. And Russian Transport Minister Maxim Sokolov said the claim that terrorists brought down the plane with an anti-aircraft missile “cannot be considered reliable,” according to RIA Novosti.
The Egyptian military said militants in Sinai have shoulder-fired anti-aircraft weapons that only shoot as high as 14,000 feet, far short of the more than 30,000 feet at which Flight 9268 was flying when it dropped off radar.
To reach such an altitude would require missiles using special launch pads and radar systems operated by engineers, the military said.
Nonetheless, Air France, the German air carrier Lufthansa and the UAE airlines Etihad, Emirates, AirArabia and flydubai have decided to reroute aircraft scheduled to fly over Sinai.
“We will keep that measure in place as long as we are not sure of the circumstances and the reasons of the Metrojet crash,” Lufthansa spokeswoman Bettina Rittberger said. Metrojet is the name by which the Russian airline, Kogalymavia, is commonly known.
Etihad said in a statement that it was “complying with instructions by the Egyptian authorities to avoid certain areas of airspace over the Sinai peninsula,” which would affect only a handful of flights.
CNN’s Catherine Shoichet, Nic Robertson, Alla Eschenko, Alexander Felton, Arwa Damon, Nancy Leung and Radina Gigova contributed to this report.