Philo McGrew challenges Stan and Cass to perform some risky air tricks during an air show in Arizona. (This episode was the pilot for the series)
This time Spencer Parish and his pilots are involved in a case of industrial spying. A drone (a radio-controlled airplane) which was developed by Cat Atkins, an old friend of Spencer’s, falls in the hands of two employees of Atkins’ who have stolen the airplane and put it for the highest bidding as a deadly weapon. This situation endangers the lives of Spencer’s pilots.
Cass and Stan are hired to transport a deputy and a condemned murderer named Gordon en route to another prison. Once aboard, the deputy shows his true intentions, he’s not a lawman but Gordon’s accomplice and wants to set him free. A scrap ensues and a gunshot punctures the fuselage, the airplane totters down to doom.
A seemingly routine flight carrying convicted murderer Gordon Locke and the deputy sheriff escorting him from northern California to imprisonment becomes a hazardous one for Cass and Stan when the 'deputy" proves to be Locke's confederate who has engineered an escape plot that unfolds after takeoff. When the plane crash lands, Stan finds himself stranded and with a sprained ankle.
Annette Collier's, an industrialist's daughter, anticipated flying lesson with Cass Garrett becomes a kidnapping-extortion nightmare when one of her father's employees hijacks the airplane.The only clue to the whereabouts of Cass's hijacked plane is a jumbled radio message Stan (Todd Susman) believes is in code. The abductors are demanding US$600.000 from her father, Hebert Collier.
Steve Raker runs a pest control service. He hires Cass Garret unknowing that Cass is working undercover for the FBI since Rake is suspect of transporting illegal aliens into the country. All goes according to plan until one of Rake’s mechanics blows Cass’ cover.
Cass, Stan and a friend discover that a mountain lake is the haunt of a gang of spies. These enemy agents are planning to blow up a secret facility of experimental fuel endangering the lives of local people. Aided by federal agent Jason Babcock, the pilots begin a race against time to locate the bomb and defuse it in time ...
Stan and Cass manage to convince Spencer to work with them in the acquisition of a "bargain": an old twin-engine propeller. But when the two friends see his new purchase, they suffer another disappointment: the old airplane is in a deplorable state. Fearing Spencer's reaction, Stan and Cass decided to take the plane to the mechanic Wig Wiggins, even at the cost of interrupting his vacation, to tidy it up a bit. En route to Spencer Aviation, Cass and Stan help Susan, an expectant hitchhiker, search for her husband, who is looking for work in the oil fields.
Spencer is flying an old WW II boat that crashes in the desert with his proteges, Cass and Stan, and their client, Maggie Newcomb. They struggle for survival until rescuers, headed by Cozens, arrive.
Maggie Newcomb is the brave survivor of the desert plane crash that tests her mettle as well as that of Spencer, Cass and Stan when the burning heat and their injuries combine to jeopardize their lives.
Spencer is indebted to Maggie, he knows her from the war when she saved his life after a plane crash. Therefore, he relinquishes his drinking water to leave a little bit more for the weaker hurt woman. However, the glowing heat and the bad injuries undergone by the survivors in the accident become their worst nightmares.
Cass, accompanied by Stan, subtitutes temporarily for a friend as a helicopter pilot for tourists at San Pedro port. One day, Marie, a young woman climbs aboard as passenger and once in flight she beseeches that Cass and Stan land at sea upon his grandafther's yacht. After their refusal, Marie proceeds to explains her situation. She is Marie del Gardo, the granddaughter of a man sought by hired killers and asks Cass and Stan to get him out of the country.
Hank, a murderous bomber whom Spence (Gene Evans) helped convict 26 years earlier is out of jail---and out to get him. Two explosions shake Spencer Aviation site and one of them hurts Wig Wiggins. Further investigation show that it was the work of an expert bomber. Stan and Cass must warn Spencer but he's far way involved in a sailplane competition.
Willie Hunt, a destitute pilot suffering from blackouts, defies his doctor's orders and volunteers to help Spence (Gene Evans) transport a shipment of high explosives. Befriending this old pilot who is suffering a serious ailment puts Cass in a precarious position when the older man has a blackout while flying the deadly shipment.