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If one is looking for safety information on commercial aircraft, there would be no better place to check then with the manufacturer of the aircraft itself. They would have all necessary information one would be looking for in regards to safety information regarding the aircraft.
because there is no gravity
Many commercial aircraft are owned by the airline, which would include the jet engines. A substantial fraction of commercial aircraft are owned by aircraft leasing companies, and leased to the airlines; in this case, the leasing company would own the engines.
It depends where the rock was formed. If it was formed inside the earth, it would be rough. If it was formed on the surface, it would be smoother than the rock formed inside the earth.
There are four interrelated elements of aircraft performance: lift, weight, thrust, and drag. While the number of people, per se, wouldn't affect the performance of an aircraft, the weight of those people would. --- Also, the position of those people would matter in terms of aircraft performance.
Stealth aircraft are made so they don't show up on radar very well, or at all. This is important if you're going out to blow something up and don't want to be seen. Commercial aircraft could not be stealth aircraft because you really need to be able to see one on radar. Air Traffic Control uses radar to detect aircraft in its area, other planes use radar to detect you in the sky...having a commercial plane that couldn't be seen on radar would be very bad. - - - - - the difference is like police and thief.
Parachutes would add weight to the aircraft. Also, the passengers on board would not know how to use a parachute even if they had one, or might not be able to. An event in a passenger aircraft that might need a parachute would be very rare anyway. Some smaller aircraft have 'BRS' parachutes which parachute the whole aircraft to the ground. Commercial airlines do not carry parachutes as there is unlikely to be a situation which would merit their use. The costs (not neccesarily meaning financial costs) would far outweight the benefits.
If you own a civil aviation aircraft, you would be based at a specific civil aviation airport or airfield and you would have to rent a hanger there. Commercial airlines usually keep their aircraft in service for 30+ hours at a time (switching pilots of course.) When they do go in for maintenance inspections, the airline would pay to use a hanger at a larger passenger airport.
A fighter jet can just barely fly without the canopy. It would totally upset the pitch of the aircraft and it would have to fly very slowly due to the incoming wind. If the aircraft was above 12,000 feet this lack of pressure would affect the pilot, he would have to lose altitude and land the aircraft soon.
The effect of a hole on a paper airplane would depend on the type of paper airplane the hole is on, and where it is on the aircraft.
Volcanic islands are formed by volcanoes and are therefore composed of volcanic rock.
it would not affect the earth in anyway because all volcanoes do is kill,hurt and destroy !