[Dukie]

I thought about that too. Only three .... sounds like the "missing man" formation.

[Spook86]

Please note that missing man formation has four aircraft; the "missing" aircraft pulls up and away as the formation passes over the cemetary or memorial site. If it was a missing man over Arlington (very real possibility), the fourth plane might have been spotted above and offset from the three-ship "wedge"

One more thought: Col Francis "Gabby" Gabreski, the AF's leading ace in Europe during WWII, died late last week. If Gabby was buried at Arlington, the fly-by (if that's what it was) might have been for him.