R0 on a ship will always be higher than in pretty much any other situation. Most ships are packed to the gills, and in a gigantic ship like a carrier it will be

R0 on a ship will always be higher than in pretty much any other situation. Most ships are packed to the gills, and in a gigantic ship like a carrier it will be even worse, since most of the crew will be in poorly ventilated areas rather than on deck.