By the start of World War II aircraft looked different than a decade earlier and were much more powerful.
Fighters achieved top speeds of around 550 kilometers per hour; heavy bombers with four engines carried 5 tons of bombs and ranged 3,000 - 4,000 kilometers.
In World War II, airplanes were much more important than in World War I.
The German Luftwaffe was the first to use tactical bombers as flying artillery, vital for their 'Blitzkrieg' tactics.
Powerful strategic bombers were developed to pound enemy industry and even cities into rubble, though they suffered heavy losses themselves too.
In the Battle of Britain the Royal Air Force
fended off the Luftwaffe's attempt to achieve air superiority, thereby preventing a German invasion of Britain.
By the end of World War II propeller-driven airplanes had almost reached the end of their potential.
Fighters reached top speeds of about 700 kilometers per hour and attacked with guns and rockets;
strategic bombers carried loads of up to 10 tons to ranges of several thousands of kilometers.
Some bombers were bristling with defensive gun turrets like flying fortresses; the Boeing B-17 was named just like that.
At the end of the war, just when development was stalling, Germany and Britain independently developed jet engines,
ushering in a new era of high-powered jet aircraft.
Soon almost all fighter and many bomber airplanes were jet-powered, though propellers remain in use for aircraft that do not require very high speeds.
Many of the latter category adopted turboprop engines.
War Matrix - Monoplane
Second Industrial Revolution 1880 CE - 1914 CE, Weapons and technology