While most empires developed flying boats to visit their far-flung colonies, the biggest countries (Russia and USA) would develop airplanes for internal routes. Early airliners would still rely heavily on mail contracts.
ATL Without WW1, the Russian Tzar would remain on the throne, though hopefully he would encourage industry to expand (like in Tzar Peter the Great’s time). Small airplanes (up to 6 seats) would remain sports cars and limousines for the wealthy. Bushplanes - on floats or skis - would help coonect far-flung communities in Siberian wastelands. Gov’t owned bushplanes would patrol borders, coastal waters, fisheries, survey forests, connect mining towns, evacuate sick and wounded, etc.
Finally, medium-sized, twin-engined airliners would provide faster transport on the busiest routes. The distance between Petrograd and Moscow is 635 km or 400 statue miles, roughly 4 hours in a biplane airliner