Well every aircraft listed on your original post is categorised by you as a "first".
Perhaps what you really mean is the type in its class, generation or design having most effect on the development of its particular role or the advancement of aviation in general.
I'd look again at your categorisation of the Spirit of St Louis. If the ability to power an aircraft over long distances is your criterion then the Rolls Royce Eagle VIII which powered the Vickers Vimy beats the Wright J-5C chronologically and in terms of extended operational service.
The Wright J-5C had built in features regarding lubrication and continuous operation. The J-5 engine series, not the aircraft or the one sub series, should be included as the progenitor of a range of Wright radial engines which powered a vast range of military and civil designs over four decades and which led other manufacturers to follow.