A famous pianist from behind the Iron Curtain seeks political asylum in this country. Is he genuine, or is he perhaps a spy?

It is vital that pioneer airman Selkirk and his daughter Jo get the Class One licence which will make Selkirk Airways a recognized airline.

When a luxury air tour of Europe proves dangerously expensive to one of the wealthy tourists, Garnett joins the party and almost becomes a blackmail victim himself.

Garnett and Delaney wonder what a professional assassin can be doing at the unimportant Middle East airfield of Garobo.

When Air Security is called in to investigate the death of an elderly passenger, who apparently fell through an open door on a cross-Channel flight, Alan Garnett finds himself mixing with out-of-work actors.

Garnett and Delaney are on the track of the illegal adoption racket between Italy and America, but seem to draw a blank when it leads them a delightful children's nursery run by the benign "Uncle George".

Maya begins to suspect that her brother may be implicated in narcotics smuggling when he starts to spend far more than an air steward's salary. Since he got the job on her recommendation this places her in a spot.

When Archy Vance, released from a United States prison, flies to London, he is recognized at the airport by Garnett, who puts Delaney on trial. Delaney soon finds himself deeply involved in a robbery which is as startling as it is audacious.

Someone on board a flight from New York is being kidnapped, and Airline Security chief Alan Garnett has the difficult task of trying to find out which passenger it is.

Trying to sort out a marriage problem may be nothing to do with Air Security, but Garnett finds himself acting as a marriage broker when he is faced with a formidable Greek family with two unmarried sons, and a pretty girl who has come all the way from New York to marry one of them.

A young woman suffering from loss of memory in Chicago, and a murder the same evening in Detroit…it takes the astute mind of Garnett to suspect, and eventually prove, a connection between the two.

Many children make long journeys alone in planes, but when little Peter Firth arrives from Chicago and there is no one to meet him, he becomes just another responsibility of Zero One.

Garnett, personally escorting a valuable painting to an art museum in New York, finds on arrival that he has been guarding a fake. He feels it is his duty to trace the real masterpiece as quickly as possible.

A tip-off reveals that an attempt will be made to knock out a heavyweight championship contender on an airline flying from Los Angeles - before he can even reach the ring in London.

On a flight from Montreal, young Mrs Clandon dies, apparently of heart failure, another passenger, the elderly Mrs Pendenny accuses Mr Clandon of murdering his wife. Obviously her charges must be investigated - but Mrs Pendenny is known by her friends, among them Mrs Trapp, to be an incorrigible liar …

In tonight's episode, the pilot of a plane bringing the president of a Middle Eastern state to London. But during the flight it is discovered that one of the tyres has been tampered with - and the plane will explode on landing. Jimmy Delaney, Garnett's American assistant accompanying the president, has to make a decision that may well cost the lives of all on board.

When Elkinson's memory seems to be failing him, it is more than his personal happiness that is at stake - the lives of his passengers could be endangered. His problem soon becomes one for the air security officers.