Originally Posted by
Propduffer
The tail location is about 30km from the main search area.
The main search area is about 60 miles from the last known position.
AirAsia jet tail found underwater, black box may be close by | Reuters
The tail of a crashed AirAsia jet has been found upturned on the sea bed about 30 km (20 miles) from the plane's last known location
so if the tail was found 30klms from the last known location, and the other debris found is 100 klms from the last known location, indications are that the aircraft broke up at high altitude.