No, air travel from the US (or anywhere else) to Arusha or Dar es Salaam, Tanzania is not included. These flights are easily booked online, or through a travel agent. We can recommend an agent that we use for all our travels to Africa, who would be glad to assist in getting the best fare available.
That said, the easiest and most efficient way to get from the US to Tanzania is with Delta as they are a partner with KLM and have flights that connect in Amsterdam for a non-stop KLM flight to Tanzania.
All internal flights will be booked through Grand Ruaha and the price of these flights is included in all of our safaris packages.