Early aircraft were usually made of spruce wood frame with a painted canvas skin stretched over.
This was not always the case however, plywood and sheet-metal skins were also used. Aluminum was rarely used as at the time it was very expensive.
Aircraft and avionics mechanics have always fixed airplanes - nothing special happened in 1958 to change that.
Airplanes are made almost every year since 1900.
Some airplanes are made in the US, but not all. there are several other countries int he World that can make airplanes too.
The same way you register a firearm made after 1940. In MOST of the US, there is no registration of firearms. Firearms made prior to 1899 are legally classed as antiques, and not as firearms. Not aware of anything special about 1940 in US gun laws- but you may be in another country. If so, check with law enforcement where you live.
Airplanes are made for fast transposrt of passengers or cargo. They are also used for defence purposes.
Airplanes made transportation easier. They have made transportation faster. The disadvantage is that they are costly.
What is the value of pinocchio by collodi before 1940
Although the company was founded on January 18,1919, the first car was not ready until September of 1921. Prior to building cars, Bentley made engines for airplanes.
Romania
for quick trans.
LEXAN
If the question is referring to "Just Prior" to 1940, the answer is the United Kingdom, France, Saudi Arabia, Iran, and Turkey. If you are referring to the Middle East since the dawn of civilization until 1940, the list is significantly longer.