Roald Dahl
Charlie and the Great Glass Elevator (1975)

The Great Glass Lift was a thousand feet up and cruising nicely. The sky was brilliant blue. Everybody on board was wildly excited at the thought of going to live in the famous Chocolate Factory. Grandpa Joe was singing. Charlie was jumping up and down. Mr and Mrs. Bucket were smiling for the first time in years, and the three old ones in the bed were grinning at one another with pink toothless gums.

"What in the world keeps this crazy thing up in the air?" croaked Grandma Josephine.
'Madam,' said Mr. Wonka, 'it is not a lift any longer. Lifts only go up and down inside buildings. But now that it has taken us up into the sky, it has become an ELEVATOR. It is THE GREAT GLASS ELEVATOR.
'And what keeps it up?" said Grandma Josephine.
'Skyhooks,' said Mr. Wonka.