Captain Lyall

In the short story The Kidnapped Prime Minister, Captain Lyall was a Royal Flying Corps pilot at Hendon Aerodrome. At the end of the story, Poirot asked him to fly the Prime Minister David MacAdam to the Allied Conference in Paris. He managed to deliver his passenger in time.

Captain Lyall is not featured in the film adaptation of The Kidnapped Prime Minister in Series 2 of ITV's Agatha Christie's Poirot. How the Prime Minister got to his destination is not mentioned but in both cases, he got there in time.