Question: For the type of aircraft that were used on flights from Daporijo airport to Guwahati and Dibrugarh, how many were in service in July 2017?
Sentence (from "Dornier Do 228"): The Dornier Do 228 is a twin-turboprop STOL utility aircraft, manufactured by Dornier GmbH (later DASA Dornier, Fairchild-Dornier) from 1981 until 1998.
Relevant evidence: No