How many possibilities are there for a missing plane?

Loss of contact or due to an accident.

1.It is possible that the aircraft has lost contact for a long time and that the crew is disabled. For example, due to the failure of the aircraft's slow release crew, the aircraft is in hypoxic shock, but under normal circumstances, the cabin crew requires to enter the cockpit regularly to pay attention to the crew condition, so this is unlikely; Another possibility is that the communication system fails, but the crew has procedures in place to deal with it.

Therefore, it is unlikely that the above two conditions caused the aircraft to lose its radar signal.

2.If the aircraft simply loses signal, it can be identified by ground control if it is handled according to ICAO standard procedures, such as the transponder setting 7600. This time, it is likely that a mechanical failure or other reason caused the aircraft to change dramatically, and the crew simply did not have time to take into account the standard procedures.

Plus the 777 aircraft has a range of about 10 hours. As a result, the aircraft may have "had an accident" resulting in a loss of information.

Analysis of the possibility of an accident.

1.If the plane disintegrates at high altitude, there is almost no chance of survival. Once disintegrated, the aerodynamic force of the aircraft broke and could not be controlled at all.

2.If the high seas are far away from the coastline, the plane enters the sea in a sharp state, and the effect is the same as if the plane fell to the ground, so the possibility of survival is very small.

3.If the main operating system of the aircraft is effective and the captain can control the attitude, the forced landing may be successful.

In addition, the aircraft has a certain level of safety when operating and landing at low altitudes, and sometimes it is even safer than a forced landing on land. Because unless the ground is a specially designed site, a large aircraft like the Boeing 777 is likely to cause the landing gear to sink into the ground and break off and rub against the ground as soon as it is grounded.

There have been success stories before. In 2009, American Airlines Flight US1549 crashed into a flock of birds after takeoff, and successfully landed in the Hudson River on the way back, and all 146 passengers and 5 crew members on board were rescued.

Therefore, if the pilot is experienced in the water landing is safer than on land.

Summary. Loss of contact with the aircraft means that the communication between the aircraft and the ground is interrupted, and the communication signals and location information of the aircraft cannot be received. This usually indicates that the aircraft may have had an accident or suffered an unfortunate situation.

Loss of contact with the aircraft means that the communication between the aircraft and the ground is interrupted, and the communication signals and location information of the aircraft cannot be received. This usually indicates that the aircraft may have had an accident or suffered an unfortunate situation.

Can you add, I don't quite understand it.

Aircraft loss of contact means that the aircraft is interrupted from air traffic control or ground communication during the flight, and the communication signals and location information of the aircraft cannot be received, or the information received is incomplete and inaccurate. This can be due to mechanical failures, bad weather, terrorist attacks, misoperation, etc. When the plane is lost, the airline and relevant departments will immediately activate the emergency mechanism, search and rescue operations, in order to find the plane and passengers as soon as possible.