At Arrowhead Stadium:
As you probably know the budget cuts have eliminated the military flyovers at large events. Well, there’s a group of guys in Kansas City who do some formation flying in their own planes and that decided they’d volunteer to pick up the slack. They invited a couple of other groups to join them and before they knew it they had 48 guys with their homemade RV airplanes signing up to join in. If they had more time, they probably would have gotten an even larger group as people kept joining and a 49th was added near the event. One additional feature of the flyover was the use of pink smoke for cancer awareness. The folks from the Guinness Book where there and are expected to confirm it as the largest formation flight ever. And to top it off the crowd later set the record for the loudest gathering at a football stadium.
Thanks to Ann C for the above link
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