Originally Posted by
procede
My guess is that the transponder sends out the pressure altitude until there is weight on wheels. As Vilnius is at 200m/600 ft, this would account for half of the drop. A low pressure area could do the rest.
Exactly that. Both facts that seem to have passed AH by. It would have been better to have no graphic at all than the misleading one - the actual touchdown appears to have been near the point labelled "FL011".