Question: What year was the act which ended scheduled airland service at London-Corbin Airport passed?
Sentence (from "London-Corbin Airport"): Prior to the passage of the Airline Deregulation Act, the airport was served by Piedmont Airlines (1948-1989) turboprops, including the Fairchild Hiller FH-227 and the NAMC YS-11.
Relevant evidence: Yes