Outside limits what's a LCC mentality? The aeroplane must fly differently at Qantas because it has business class.
I mean come on, you're clutching at straws. I suppose Virgin Blue must have used voodoo or something.
Your contacts say they're empty hey? Well how about speaking to the actual guys that fly them! (sic)
I'm assuming you have staff travel? Try and get a seat. The loads are there for you to see. It's not a great mystery.