The relevant flights:
IB6845, Sunday 3rd August 2008 Madrid Barajas Terminal 4S Departure: 12:25 Buenos Aires Pistarini Terminal A Arrival: 19:40 IB6842, Sunday 17th Agugust 2008 Buenos Aires Pistarini Terminal A Departure: 13:25 Madrid Barajas Terminal 4S Arrival: 6:10
I still have 36 hours to cancel these flights without pay anything in case I find something cheaper, but I do not think so. If you are in any of these flights as well, mail me!
There is an option in penta to see the travel data of other attendees, but it is not enabled yet.