Working in aviation probably puts you in a mindset that makes it harder to parse. It's not being used in a way that is related to flight or aircraft.
It's like if people were discussing where to have a conference, and one of them proposed a hotel. Then another person suggested a resort. Then a third person floated a cruise ship. Cruise ships do float, but it has nothing to do with anything. They are floating the idea of the ship as a venue.
Do you normally "float" a cruise ship though? A more apt analogy might be "dock". Maybe a news report says that a vacation company has broken some regulation so the government docked a cruise ship, meaning they took away a cruise ship like you would dock someone points. It's ambiguous at best.
You could float the idea of it, and you might also think that to float a ship means the process by which it is landed in the water when coming out of a dock?
It's like if people were discussing where to have a conference, and one of them proposed a hotel. Then another person suggested a resort. Then a third person floated a cruise ship. Cruise ships do float, but it has nothing to do with anything. They are floating the idea of the ship as a venue.