Fly in the Sky circulated as a short TikTok trend sound, shared in edits built around height, movement and open air. Its exact original source is not widely documented, so its identity online comes from how creators reuse it rather than a single film or show. Clips using it often feature rooftops, paragliding, plane windows and city views from above. The trend keeps returning because the feeling is universal and easy to apply, giving everyday travel and lifestyle footage a lighter, more cinematic finish without a complicated edit.