If you go here:
http://casperflights.com/ and select the Bordeaux airport, then set the time to around 10:30am local time (GMT+1) you can pick up the flight.
It may show up as GWI18G or Unknown. Hover over it and you can see the rapid descent, but also how far it still travels in that time. The speed never changes, in fact it appears to speed up for a while. There are large(er) airports around that they could have turned to in case of an emergency, like Nice, Marseille, possibly more.
That tells me the plane was either flown by someone who did not want to do so, or was incapable of doing so. The amount of time and distance the plane kept flying after it started its rapid descent does not indicate to me that it disintegrated in the air. Maybe a cabin pressure problem that left everyone unconscious? Or... malicious intent. IMO MOO