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No Highway in the Sky
Dennis Scott, new chief of metallurgy at the Royal Aircraft Establishment at Farnborough, is introduced to Theodore Honey, an eccentric American scientist who is testing his theory that the new Rutland Reindeer aircraft is susceptible to structural failure of the tailplane. Honey is running a fatigue test on the tail assembly of a Reindeer, using a very high vibration rate dynamic shaker in an eight-hour daily test cycle (determined by complaints from neighbours). Eventually, it will fall off.
Scott gives Honey a ride home and learns that he is a widower whose wife was killed by a V2 rocket during the war. The perfect embodiment of the absent-minded professor, Honey has educated his brilliant but reserved 12-year-old daughter, Elspeth, at home, without any real understanding of a child's need for play and friends. Honey tells Scott he expects failure to occur after 1440 flight hours. Scott notes that commercial planes are building up miles faster than the experiment, and Honey becomes very upset, declaring that he is a scientist, he cannot be concerned about people.
In the company bar, Scott runs into a test pilot, an old friend from WWII, who tells him about the recent crash of a Reindeer in Labrador. The plane had flown 1407 hours. The tail was never found, the pilot was blamed, and Scott suspects Honey's theory is correct. He informs Sir John, the head of RAE, who puts the vibration test on a 24-hour basis.
Honey is sent to Labrador to examine the wreckage, but finds himself flying across the Atlantic on a Reindeer airliner. He was told that all Reindeer have only 500 hours in service, but is shocked to learn that this early production aircraft had already logged 1422 hours at takeoff. Despite the fact that his theory is not yet proven, he warns the captain, who contacts London for advice. Honey also shows the safest place to survive a crash to renowned Hollywood actress Monica Teasdale, who meant a great deal to his wife. Teasdale believes Honey and through a night of waiting she grows close to him, as does stewardess Marjorie Corder.
The Reindeer lands safely at Gander Airport in Newfoundland, and an inspection clears it to continue on its route. Honey takes drastic action to stop the flight by retracting the landing gear, dropping the aircraft on its belly and wrecking it. Honey is detained, and Corder offers to go to Elspeth when she returns to England.
The next day, Teasdale speaks to Honey's superiors on his behalf. Sir John promises to seek the truth. However, there are powerful men who demand that Honey be repudiated to discredit his unproved theory and to save the reputation of British passenger aviation, which is now awash in a sea of bad press. Sir John tells a shaken Honey that he must undergo psychological testing. Honey goes home to find the house in order and Corder spending the night with Elspeth.
Teasdale, who has also been helping Elspeth, abruptly leaves for California, deliberately allowing space for any romance between Corder and Honey to develop. Honey returns to his experiment but the 1440th hour soon passes without any structural failure. Corder is angered by his readiness to surrender and his failure to see how Elspeth is suffering.
During a board meeting, Sir David questions Honey's sanity. Honey finally objects, refusing to be railroaded. He resigns and threatens to protest at the departure of every Rutland Reindeer—and collapse them, too. He walks out. At home, Corder worries what he will live on and discovers that he has not deposited his salary in the bank for seven months. Laughing and crying, she says he has to have someone to look after him. She is going to marry him.
Meanwhile, the Reindeer that Honey disabled is repaired, but the tail falls off after its next landing. The tail spar is found in Labrador, showing metal fatigue. Scott, Sir John and Corder run to tell Honey in his lab and there is a horrific crashing noise as the tail separates, at last. Honey realizes that he failed to account for temperature fluctuations to affect the timing of the Reindeer's tail failures.