RC plane fireworks

[displayfireworks1]

Anyone know how they control the fireworks firings on these little RC planes?

https://www.youtube.com/watch?v=fW0rduX7zjQ
.
Same with these larger "Real" airplanes. How are they controlling the firings?

http://vimeo.com/54048313

[wizard7611]

Imagine using gerbs, comets, roman candles, and mine candles on one of those planes lol. Very amazing!:cool: