FLY HOME FREE

As my 11 year old daughter munched on Kurkure, she observed a special offer mentioned on the top of its packet. It read ....  "FLY HOME FREE, WIN AN AIR TICKET EVERY HOUR"

"Wow Mom, what if I win an air ticket ?
  If I win this offer, how will they know where my home is?
 And if I am at home, then is the offer still valid?

 "Don't worry, I said, these offers never go beyond the packet"