There's a scene in Blackhawk Down where a similar thing happens. Aided has a kid sitting around near the airport with a cellphone who calls in when he sees all the helicopters take off. I can't find any references if this actually happened or not.

Of course, this type of situation is kind of hard to avoid. Making sure that there's no one within line of sight of the take off path of an airport is kind of hard if it's anywhere close to a populated area.