Viola!! like a swarm of bats hijacking the sky!!
So when some Indian RC club planning  to challenge the record!! 

Are there so many fliers in India? If yes, then all have 2.4GHZ?

I think this is pulled of by using a mix of 2.4Ghz and regular Mhz/FM radios. In India, there are people using various Mhz/FM bands (72, 35, 40, 27?), so if we plan carefully, it can be pulled off