This series was produced by Brian Donleavy himself and was rented out for syndication when none of the TV studios wanted to buy or air it. It's based on the radio series of the same name, which Donleavy also starred in.
The airplane shown in each of the episodes is a Lockheed Constellation noted for it's triple tail design.
According to Billboard Magazine dated February 18, 1950, 'Dangerous Assignment' starring Brian Donlevy made it's television debut on Monday, February 13, 1950 at 10:30-11:00 pm on the NBC television network.