Good first line note above...
BUT.....
RYR are one of the airline world leaders in mining data & writing algorithms from that & together with their experience of being Europe`s largest pax carrier.
RYR do nothing within their booking philosophy which might be regarded as chance.
There will be an algorithm to cover or predicting IN THE TOTAL the income from any of the advertised "sales".
How to make a billion in the airline world?....install RYR`s booking software together with their route & pax anaylsis database (priceless) I would suggest.