We do ships all the time and have succeeded at it because we can clean huge areas in the fraction of the time it takes with portables and to a much higher standard. Ferry carpets tend to be very dirty so to cover the areas they need done within very tight deadlines makes it a problem with portables. A lot of ships have their own equipment and only use professionals when they have to.Aircraft tend to be done with tm's too but not exclusively but you've got the same problem....time!Simon