The camera pans across the floor below two rows of passenger seats. The carpet is littered with so many potato chip crumbs it appears as if there was a recent in-flight snowfall. “Cabin crew told us they don’t clean between flights,” reads the caption on a TikTok video taken on a recent Ryanair flight from the Canary Islands to London. In another recent video, a passenger’s hand thumps the seat, causing a dense cloud of dust-like particles — also resembling snow — to rise up on a Qantas fligh...