Looks like some conference occured on this date in 2015, let’s google it

Open the link to a Wikipedia article about 2015 UN Climate Change Conference. It was held in Le Bourget

One of the most famouse museums in Le Bourget is National Air and Space Museum of France

Find in Google “Le Bourget plan du musée” by the first link check the name of the room in front of the entrance:

It is Salle des Huit Colonnes:

Let’s return to the Wiki article about Climate Conference and find that it was signedin New York:

The first non-stop flight between Paris and New York was performed by Augustus Lindbergh:

He did it on the “Spirit of St.Louis” aircraft

From the technical specification we see that it had 223 hp engine:

Google search results about first non-stop flight from Paris to New York:

There is a commemorative post card about 50th anniversary of this flight. The flight was performed by Dieudonné Costes and Maurice Bellonte on the Costes’s Breguet XIX Point d’Interrogation aircraft:

Open the https://www.museeairespace.fr/ page and find this airplane there. It had 650 hp engine:

So, 650 - 223 = 427 hp:

Used tools:

• Google text search
• Wikipedia Articles