firstchoice good questions. No idea! Perhaps they were exploiting a window specific to this particular type of aircraft? Perhaps they were seeing whether a commercial airline pilot and passengers would be able to stop them? I have no idea and I don't even like to think about it much deeper.
Merry that's true. It's like the moon landings. About the only people who never openly doubted them were the Russians, which should tell us something.
I'm not sure about the stopping, dropping off and refuelling business. The plane has apparently been found right at the very end of the southern arc, meaning that's as far as it could conceivably get in 7 hours from its last known location. I don't know. Do you mean that the 7 hours was basd entirely on the pings with no thought as to the fuel? My head is starting to spina bit, but if it was landed and refuelled the pings and the fuel wouldn't add up, would they?
I mean, someone must know how much fuel it had and would have thought 'ok, this weight of plane, this much fuel = 7 hours flight time, max = this maximum circumference of possible crash sites. For example. So the 7 pings would tally. But if they stopped, unloaded, and took off again, they could calculate the amount of fuel, but they'd surely be pinged one time too many for the original max time/distance that the investigators would allow.
Unless the additional distance possible by the removal of the cargo would equal out the time taken to land, unload and take off again.
Argh. Brainache.