just looked for 2 tickets FRA-SFO for next June. With 'the FB member is flying' I got 90.000 Miles for 2 Tickets; how does that work?

Departing from : Frankfurt, Frankfurt Intl (FRA), GERMANY
Arriving at : San Francisco, San Francisco Intl (SFO), USA

Departure date : Wednesday, June 7, 2006
Return date : Thursday, June 22, 2006
Your Miles balance : xxx xxx Miles
From : 90 000 Miles

Passengers : 2 Adults

"Open Miles" option, for Air France and KLM flights only Skyteam Award scheme

Business From 320 000 Miles
Business From 125 000 Miles

Economy Class From 200 000 Miles
Economy Class From 90 000 Miles