Alliance Airlines will continue to provide fly in, fly out charter services from Perth to BHP's Coondewanna and Barimunya mines for two more years.
It operates the services using Fokker 100 and 70 jets. Cirium schedules data shows it flies seven times per week to Barimunya, and nine times to Coondewanna.
The extension builds on a 10 year relationship between BHP's Iron Ore division and Alliance.
Last year the airline secured an extension to a key contract with BHP's Nickel West division to provide flights from Perth to its mines in the Goldfields region of Western Australia.