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If instead of at the beginning of the first decade of the 20th century heavier than Air flight was developed in either the 2nd to last decade of the 19th century or even the last decade of the 19th century.
If you look at how fast aircraft developed IOTL essentially a decade from the first Wright flyer to WW1 fighter planes, one wonders what kind of effect an early 10-20 years head start would have done?