This is a webtoon I've been looking for for a while. I don't remember whether it was a manhua/manhwa/etc. The MC/FL is a famous architect who, iirc, does not do well on planes (because of some past trauma...?) but has to travel a lot for her job, so she takes sleeping pills whenever she flies. The ML is the new pilot for her private plane.
Lili, I found it It's called Airplanes. "Sora is a renowned architect famous for a number of buildings across the globe. For a woman who needs to travel so often for work, Sora's career choice ironically clashes with her fear of airplanes." https://www.webnovel.com/comic/airplanes