[Roger Darthwell]

Apologies for bumping this thread back up, but given that this is the place for all kinds of ''silly questions'' about media, I have one. I have a question about an aspect of American television that I always found weird and that is preemption of network programming. I have heard that network affiliates in the United States sometimes preempt network programming, so my questions are: What are the reasons for an affiliate to preempt programming? How much network programming is an affiliate allowed to preempt? What happens to the preempted programming, does it go to another station or it's being broadcasted later? And finally this practice of network preemption is done only in the United States or also in other countries like Canada or Australia? I hope I don't disturb you by asking these questions