HP,
I'm not going to get drawn into argument over this, but I have drawn my evidence from more than one place. Among them -
Quotes:
"I find the same thing with the summer flights"
"Every one I speak to that flies for a living tells me the same thing."
Also, read some of the other replies.
I agree, I do not have the numbers to make any statistical certainty, but I am just expressing my view as I see it.
PS