When flying to/within Tajikistan:

For adult passengers – a passport

For children – birth certificate

For international flights:

Adults must have a passport and visa, if necessary. Children should be included in the passport of a parent or have their own passport. For unaccompanied minors a notarized parental consent to travel is required. For children traveling abroad with one or both parents, the border police may be require a proof of the relationship between the child and the accompanying parent/s. Pay special attention to the validity of documents. Passengers with expired passports are not allowed to flight.