What was the first airliner ever?

Good day, for most people, planes are something totally banal and do not realise that is represents one of the greatest achievement of Mankind. Indeed, Aeronautics was neither an industry or a science but a miracle according to Igor Sikorsky, a man who brought so many stones to the building, One of these is the very first real passenger aircraft of the world : The S-21 ''Russkie Vitaz'' which means in the language of Pushkin ''Russian Warrior''. This Master-class is a pure concentrate of innovations and even impressed the last Tsar of Russia!
PS : I could not find pictures of the plane showing correctly the tandem engines.
Sources :
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Soundtracks :
Air Conflicts: Pacific Carriers - Soundtrack - Main Theme • Air Conflicts: Pacific...
The Last Cat : • The Last Cat
Dogfights 01- Band of Warriors v1 - Soundtrack • Dogfights 01- Band of ...
Dogfights 06 - Dogfights 2 v1 - Soundtrack • Dogfights 06 - Dogfigh...
Air Conflicts: Pacific Carriers - Soundtrack - December • Air Conflicts: Pacific...
Air Conflicts: Secret Wars OST - Main Theme HQ • Air Conflicts: Secret ...

[@hodaka1000]

I'd heard about the Sikorsky that was hit by an engine that had fallen from aircraft flying above it at an air exhibition in 1913 but I thought it was destroyed and all onboard the Sikorsky were killed
I could be wrong but from memory the aircraft that lost the engine and caused the accident managed to land

[@F-14DTomcat]

Well, we are both reassured that everyone survived.