I guess they are waiting until they are sure that everyone that will be receiving a 'no' has received one because can you imagine how people would feel if a 'maybe' email had been sent to someone whilst another person from the same day hasn't received anything...thinking it is a no. it has happened before with other similar programmes. it may lead to people topping themselves....I have had a similar experience with other jobs finding out that others have gotten through and I had no news and not knowing - and then finding out it was a NO. It's a horrible feeling. I believe in the UK, outside the aviation industry, it's common practice to send the 'no's' out first.