This operator can help select your international flights, but you'll have to book them yourself help
Fly to/from Abeid Amani Karume Airport (ZNZ - Check price) on Zanzibar. Or fly to/from Dar es Salaam (DAR - Check price) . There are daily ferries between Dar es Salaam and Zanzibar.
A transfer from and back to the airport is included
Additional accommodation before and at the end of the tour can be arranged for an extra cost
Very open and easy communication via WhatsApp from the moment of enquiry. They put together a document explaining the tour, accommodation and cost. They were able to be flexible and arrange a taxi from Moshi and back for a little bit extra....