Hi righthandrule, thanks for your reply.
It was definately Friday when I flew in, and yes as you say it was on a B737.
I'd gone out the Friday before and was surprised it wasn't operated by a 757. I don't understand why when the Friday demand is usually quite high.
Anyway, your explanation would make perfect sense if it was the right day. Maybe something went wrong on Friday too?
Either way, I'm glad it hasn't been so chaotic up there all summer!