Does a cruise ship have to register if it is holding food for consumption for passengers and returns to the United States with food not consumed on the cruise?

Restaurants are not required to register (21 CFR 1.226(d)). “Restaurant” is defined in 21 CFR
1.227 as an establishment that “prepares and sells food directly to consumers for immediate
consumption”. A food service establishment on a cruise ship is exempt as a restaurant. The
remainder of the ship is not required to register because it is not manufacturing/processing,
packing, or holding food for consumption in the United States. In addition, even if a cruise ship
carries food as cargo, it is not required to register because, in such circumstances, it would be
considered a transport vehicle (21 CFR 1.227).