Two international airports: in Niamey and Agadez.
Niamey has regularly scheduled flights from Europe and West Africa.
Air France is the only major carrier with direct flights from outside of Africa, but a regional airline, Point Air Niger flies weekly between France and Niamey.
Royal Air Maroc has good connections via Casablanca.
Charter flights from Paris and Marseille to Niamey and Agadez Point Afrique (http://www.point-afrique.com/ airlines, see vols charters)
Air Algerie offers flights to Niamey from Algiers.
Afriqiyah (http://www.afriqiyah.aero) flies via Tripoli.
There are a few private companies and one mission aviation group SIMAir that do charter flights from Niamey in small planes.