Chartless.

Sloane, Cloud Symphony, 1981

Sometimes, when they came down from the cirrus levels to catch a better wind, they would find themselves among the flocks of cumulus: huge towers of modeled vapor, looking as white as Monday's washing d as solid as meringues. Perhaps one of these piled-up blossoms of the sky, these snow-white droppings of a gigantic Pegasus, would lie before them several miles away. They would set their course toward it, seeing it grow bigger silently and imperceptibly, a motionless growth; and then, when they were at it, when they were about to bang their noses with a shock against its seeming solid mass, the sun would dim. Wraiths of mist suddenly moving like serpents of the air would coil about them for a second. Grey damp would be around them, and the sun, a copper penny, would fade away. The wings next to their own wings would shade into vacancy, until each bird was a lonely sound in cold annihilation, a presence after uncreation. And there they would hang in chartless nothing, seemingly without speed or left or right or top or bottom, until as suddenly as ever the copper penny glowed and the serpents writhed. Then, in a moment of time, they would be in the jeweled world once more: a sea under them like turquoise and all the gorgeous palaces of heaven new created, with the dew of Eden not yet dry.

T.H. White, from The Once and Future King