That was only jovial and I have now altered it: sorry if you took it the wrong way. I was explaining why it was not as it seems which I thought may have been of value to you: no I do not know the costs for those aircraft though, but it you want me to explain airline price discrimination I will: it is essentially second-degree price discrimination, which is the practrice of making lower-priced goods less attractive to prevent those will a higher willingness-to-pay from doing so ie business travellers have a less-restrictive ticket/travel when they need rather than going at the lowest advertised price (the £50 you see advertised) on a less well-timed flight.
[ 31 October 2001: Message edited by: Lucifer ]