I found a very good fare on Google Flights but for some reason I can't find it anywhere else. Strangely it seems to combine flights of airlines from different alliances (AA and TAP Portugal).

UIO (Quito) - ZRH (Zurich) via MIA
March 12 - May 2
USD 839

I couldn't find any link on Google Flights that would send me to a booking site, not was I able to get any similar results through the AA or the TAP sites. I've tried multi-city and even searching the legs separately on the site of the respective airline...without any success.

Is it just a price glitch on Google Flights or is there any hope that the fare actually exists??