Zanzibar disposes of an international airport which can be approached, however, only by smaller airplanes. Therefore, most international flights to Zanzibar go through one of the big and nearby airports like Dar es Salaam, Nairobi or Mombasa. So, on the one hand British Airways, Emirate Airlines and Swiss Airlines offer international flights via Dar es Salaam. On the other hand KLM, Kenya Airways and Condor fly from Europe via Nairobi to Zanzibar. Then, from the big-city metropolises the journey to Zanzibar continues by an airplane of the local Airlines (Air Tanzania, Pricision Air, Oman Air). These flights fulfil all international standards. Alternatively one can travel by ferry from the metropolises to Zanzibar. Between Dar es Salaam and Zanzibar ferries and hydrofoils run daily in both directions. The biggest ferry company for this route is the ‘Azam Marine’. Moreover catamarans and speed boats can be rented for the crossing. Basically visitors of the island need a valid passport and a visa when entering.