That was WW1
Both sides used aircraft, early in the war, as reconnaissance. When the war started each side had a small number of aircraft on hand, so they were used almost from the beginning.
aircraft, tanks, dreadnoughts,
There are no laws which make it permitted or prohibited to use aircraft during civil war. However, many people disagree with the use of drones or fighter planes used against a country's own people.
No jet aircraft were used in WW1.
Airplanes were in use by all the major combatants before the war broke out. Germany, Russia, France, England etc all had small air corps already in use. Aircraft were used as recon from the very outset of the war.
It was the developing period of the aircraft. It was then used for transportation but only rich people were able to afford it. It was also used in war also. Otherwise there were no purposes of aircraft in the 1920s.
Radar was invented and first used during the second world war. It is still, very much in use today.It's original use was to detect, and thus prepare for, fighter aircraft and bombers.Ships and aircraft use radar for navigation and collision avoidance.Air traffic control use radar to keep track of aircraft and keep them safe.Weather stations use radar to detect rain clouds.Radar is also being used in, experimental, driverless cars.
Boats. Aircraft. Boats. Aircraft.
Tanks, aircraft, poison gas and the Dreadnought Battleship
The first USN carrier lost in WWII was the USS Langley near the Java Sea.
No, it was not.
The first plane used in World War I was the Wright Flyer, which made its inaugural flight in 1903. However, the first military aircraft utilized during the war were primarily the French Voisin and the German Taube, both deployed for reconnaissance and bombing missions. The war saw rapid advancements in aviation technology, leading to more specialized combat aircraft as the conflict progressed.