Three engines, and a letter from the lawyers
Dassault Falcon 7X · N621MM
N621MM is a Dassault Falcon 7X, and the first thing to notice is that it has three engines.
Almost nothing else in modern business aviation does. The third engine is a survivor of an older rulebook, when twin-engined aircraft were restricted on long overwater routes and a spare donkey meant you could fly the direct line instead of the scenic one. Engines got reliable enough that the rules relaxed and the industry went back to two. Dassault kept building trijets anyway, and they are unmistakable from below — a single intake set into the fin, above the fuselage.
The second thing to notice is that this aeroplane has been the subject of a legal argument about whether you are allowed to look at it.
In December 2023 lawyers acting for Swift wrote to the same student who had been tracking Elon Musk's jet, demanding he stop republishing her aircraft's movements. The letter framed it as a matter of personal safety. His position was that he was repeating public data that the aircraft itself broadcasts and the American regulator publishes.
Nothing on this page resolves that. It is a genuine disagreement between a real safety concern and a real principle about public information, and it is worth knowing it exists while you look at the map. What we can say is narrow and factual: this aircraft transmits its position in the clear, as every airliner above you is doing right now, and the community receivers that feed this map simply write down what they hear.
What we have actually seen: nothing. Not one
flight since we started logging on
14 July 2026 — while other
aircraft on this board were caught repeatedly over the same period.
Every other jet on the board is below.