The regular MFC tours, (well I try to release a new tour once per month). They are set to be flown in order.. so each one is a prerequiste to the next as this is one big huge world travel excursion and each new tour is an ongoing continuation of the previous - so they are meant to be flown in order.
The Hoho tour is just a seasonal Misty's type of neigbourhood circuit and has prerequistes.