Like any machine, airplanes can be extremely dangerous. However, when properly maintained and operated by trained personnel airplanes are much less dangerous than most other forms of transportation.
Airplanes can be any color, the FAA has no restrictions on color schemes other than requiring the tail number be easily visible. White is by far the most popular color, however.
China is the most lived in country if I understand your question. It has the most people, more than any other country on this planet.
Most airplanes can travel further than helicopters.
Nitro airplanes usually use a different kind of fuel than that of other planes. Some of these planes use castrol oil, regular oil, or diesel, it just depends on the plane.
They are similar in that both serve a purpose, and some insects have wings like airplanes. Other than that, they are unalike.
The medium-fast train is quicker than most cars and buses, but slower than airplanes.
There are many differences between modern airplanes and older airplanes. The two most significant improvements have are newer more fuel efficient engine as well as structural redesigns such as the wings.
USA.
More people live in Russia than any other European country. The second most populated country in the continent of Europe is Germany.
The United States donates the most to charities (national or international ones) than any other country.
Spaceships are MUCH faster than airplanes.