[3]When an aircraft from the Yukon and Columbia Mail Service crashes, Sergeant Renfrew (James Newill) and Constable Kelly (Dave O'Brien), of the Royal Canadian Mounted Police, suspect murder because they find the control stick jammed.

The Mounties find Louise's assistant Raymond (Karl Hackett) owns the airline managed by "Yuke Cardoe" (William Pawley) and both men had been stealing gold from the mine.

Then a few days later, James Newill saved a little girl from drowning.” Yukon Flight was the first of three Renfrew movies to be directed by Ralph Staub, whose credits included producing a lengthy on-going series of film shorts known as Screen Snapshots (1930–1958) and a number of Gene Autry westerns at Republic.

Three of Staub’s Screen Snapshots were nominated for an Academy Award, and he remains the only director in the Renfrew film franchise to have a star on the Hollywood Walk of Fame.

[4] Sergeant Renfrew of the Royal Mounted was a character created by Laurie York Erskine in 1922 and continued in books, stories and on radio for many years.