English language
Published Dec. 19, 1967
The Secret Agent on Flight 101 is Volume 46 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. This book was written for the Stratemeyer Syndicate by Tom Mulvey (who also wrote volume 8 of the Tom Swift Jr. series) in 1967. Mulvey was also responsible for editing other Stratemeyer Syndicate stories with aviation content.