I just finished reading Jules Verne's Robur the Conqueror, first published in 1886. Think of it as a cut-rate Twenty Thousand Leagues Under the Sea at a somewhat higher elevation. Not quite as intriguing--or is just that I am 45 years older now than when I first encountered Captain Nemo? Still, not a bad way to amuse yourself. Verne clearly saw the future of air travel and air superiority was with heavier-than-air craft, as well as the opportunities for strafing runs.
Like Off On A Comet!, the racism of late Victorian times is clearly apparent in its portrayal of the black servant of one of the Americans, although it is far less blunt than the anti-Semitism of Off On A Comet! You could almost talk yourself into believing that it wasn't a general contempt for black people. Almost.