related questions:
My question focus on passengers jets (goes from Embraer E-jet family to Airbus A380). I don't know why pilots would attempt to takeoff without flaps but lets say they will.
Considering all the other parameters are good enough (no crosswind, long runway, aircraft light enough,...) and the pilots are aware of this unusual takeoff configuration and adapt their action accordingly (including increasing $V_r$ and $V_2$), is it possible for any passenger jet to takeoff and stay airborn (not like the flight spanair 5022) without extending flaps?