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Looks like SAM1, I think it was called. Could be AF1, as that is whichever aircraft the POTUS is on. The Boeings he usually flies on are Special Air Missions SAM, including any decoys. I’m surprised they would use decoy flights for Europe though.
To re-word that poorly written paragraph: that plane looks like one of the Boeing planes dubbed Special Air Mission (iirc; SAM for short) that are assigned to the POTUS. I know there’s more than one, and whichever the POTUS is on becomes Air Force 1. I know they fly decoys whenever the POTUS is in a helo (Marine 1), but I’m surprised that they might have flown a decoy SAM while visiting Europe.
No escort?
Scratch that- it’s Marine One that flies with escorts.
Also- https://www.airspacemag.com/as-next/when-air-force-one-evaded-mig-fighters-180970661/